Tag: BitLocker

Fake USB devices being inserted into a Windows laptop port
August 14, 2026

Fake USB Devices Are Hijacking Windows: What You Must Know

Post By administrator Microsoft, Windows , , , , , , No Comments

Fake USB devices are now one of the most alarming vectors for gaining SYSTEM-level control over Windows machines — and the worst part is that victims don’t even need to click anything. Security researchers Alejandro Hernando and Borja Martínez publicly demonstrated a class of attacks, dubbed Plug and Pwn, that weaponise Windows’ own Plug and Play (PnP) subsystem to hand attackers the highest privilege tier on any targeted PC. If your organisation allows arbitrary USB hardware to connect to endpoints, this threat is immediate and real.

What Is the Plug and Pwn Attack?

Diagram of fake USB devices exploiting Windows Plug and Play attack chain

The human factor makes this worse than it looks on paper. In a landmark study by researchers at the University of Illinois, the University of Michigan and Google, 297 USB drives were deliberately dropped around a university campus — and users picked up and connected an estimated 45–98% of them. Files were opened on 48% of the drives, and the first one was plugged into a machine within six minutes of being dropped. Applied to Plug and Pwn, that behaviour is all an attacker needs: no phishing email, no credential theft, just a device left in a car park or reception area.

The Plug and Pwn technique exploits a fundamental trust relationship built into Windows Plug and Play: when new hardware is detected, Windows automatically searches for and installs the appropriate driver — often fetching signed vendor software from the internet or from a local driver store. Researchers found that by presenting a carefully crafted fake USB device — one that masquerades as legitimate hardware — they could force Windows to load a malicious driver package and, in doing so, execute code at the SYSTEM level with zero user interaction required.

The attack does not rely on a traditional software vulnerability in the conventional sense. Instead, it abuses a design behaviour: Windows is engineered to be helpful and automatically install drivers, and that helpfulness becomes the exploit. The technique was presented publicly at DEF CON 34, along with proof-of-concept code, meaning the bar for replication by threat actors is now dramatically lower.

How a Malicious USB Attack Reaches SYSTEM Privileges

To understand why this USB privilege escalation is so dangerous, it helps to appreciate the Windows privilege model. Standard users operate at a restricted level. Administrators have elevated rights but are still constrained in many ways. SYSTEM is the highest local privilege tier — it is the account that Windows itself uses internally, and it can bypass most user-mode security controls, read sensitive credential stores, and interact with protected kernel objects.

Here is the step-by-step chain that the Plug and Pwn technique follows:

  1. Physical or emulated connection. An attacker plugs in a crafted USB device — or, in remote scenarios, presents an emulated USB device over an RDP session — to the target machine.

  2. PnP enumeration. Windows detects the device and begins its automatic hardware identification and driver-fetching routine.

  3. Malicious driver injection. The fake device presents a device ID that matches a signed driver package pre-positioned in a reachable driver store or pulled down from the internet.

  4. SYSTEM-level code execution. Because driver installation runs as SYSTEM, any code embedded or triggered in the driver package inherits that same privilege level — giving the attacker a SYSTEM shell on the endpoint.

The attack can succeed even when the user logged in at the time has only standard privileges. That is what makes the Plug and Pwn class of attacks so alarming from a threat-modelling perspective.

Who Is at Risk from This Fake USB Attack?

IT team applying Group Policy controls to block malicious USB attacks on Windows endpoints

Any Windows endpoint that meets the following conditions is potentially vulnerable:

  • USB ports are accessible and not disabled at the hardware or policy level.

  • Automatic driver installation via Windows Update or the local driver store is enabled.

  • The machine is reachable via RDP with external peripheral redirection permitted (for the remote variant).

  • No endpoint detection solution actively monitors or blocks driver-store manipulation.

That description fits a significant proportion of corporate endpoints. The research highlights that Windows 10 and Windows 11 are both affected. Organisations in sectors with high physical-access risk — retail, healthcare, hospitality, co-working spaces, and open-plan offices — face an especially elevated threat level from a malicious USB attack of this type.

It is also worth noting that the RDP variant of Plug and Pwn expands the attack surface well beyond physical presence. An attacker who already has limited RDP access — perhaps through a phishing-obtained credential — could elevate themselves to SYSTEM without ever entering the building.

Plug and Pwn vs. Traditional BadUSB: What’s Different

You may be familiar with older USB-based attack tools such as BadUSB, Rubber Ducky, or OMG Cable, which typically emulate keyboards or network adapters to inject keystrokes or redirect traffic. Plug and Pwn is a distinct and, in some ways, more sophisticated category of USB privilege escalation because it does not depend on injecting keystrokes or tricking a user into running something.

The key difference: traditional BadUSB attacks still rely on the user’s session to execute payloads — they type commands as the logged-in user. Plug and Pwn, by contrast, exploits the SYSTEM-level driver installation process itself, entirely bypassing whatever the user’s permission level happens to be. This makes it effective even against hardened user accounts and even when application whitelisting is in force at the user level.

Immediate Steps IT Teams Should Take

Comparison of USB privilege escalation attacks versus traditional BadUSB methods

The most effective mitigations combine policy controls, endpoint configuration, and physical security. None of these steps requires a Microsoft patch — they are defensive practices that should be in place regardless of this specific research.

1. Restrict USB Device Installation via Group Policy

Windows provides granular Group Policy controls under Computer Configuration > Policies > Administrative Templates > System > Device Installation > Device Installation Restrictions. Enabling “Prevent installation of devices not described by other policy settings” stops Windows from installing any unrecognised hardware automatically. You can then whitelist only approved device classes (e.g. approved keyboards and mice by vendor ID). This is the single most direct mitigation for fake USB devices attacking via PnP.

Microsoft’s own documentation on creating a GPO to disable USB storage devices provides a solid starting point, though for Plug and Pwn you will want to go further and restrict all unrecognised device classes, not just storage.

2. Disable Driver Installation from Windows Update for Endpoint Devices

One of the attack’s delivery mechanisms involves Windows fetching driver packages from Windows Update automatically. In enterprise environments, this behaviour can be suppressed via Group Policy (Computer Configuration > Administrative Templates > Windows Components > Windows Update > Do not include drivers with Windows Updates). Driver updates should be vetted and deployed through a managed endpoint solution instead.

3. Control RDP Peripheral Redirection

For the remote variant of the USB privilege escalation, disable Plug and Play device redirection in your Remote Desktop Session Host settings. In Group Policy, navigate to Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Device and Resource Redirection and enable “Do not allow supported Plug and Play device redirection”. This closes the remote attack path.

4. Deploy Endpoint Detection and Response (EDR)

A quality EDR solution that monitors driver-store changes, unusual SYSTEM-level process spawns, and new hardware enumeration events will detect anomalous PnP activity even if policy controls are not fully hardened. Alert on any new driver installation from an unmanaged source, especially those that spawn child processes at SYSTEM privilege.

5. Apply Physical Security Controls

For endpoints in high-risk physical environments, consider USB port blockers (physical plugs that prevent insertion), epoxy fills for unused ports, or endpoint management policies that lock machines automatically after short idle periods. Physical access to a USB port is the prerequisite for the direct variant of this attack — removing that access removes the risk at source.

6. Keep Windows Fully Patched

While Plug and Pwn exploits a design behaviour rather than a specific named CVE patched in one update, running a fully updated Windows installation ensures that any related vulnerabilities — such as driver signing enforcement bypasses or PnP subsystem flaws — are closed as quickly as Microsoft addresses them. The BitLocker bypass exploit targeting Windows 11 demonstrated similarly that USB-adjacent attack surfaces can be patched, but only if your systems are up to date.

Why Signed Drivers Don’t Guarantee Safety

A common misconception is that Windows’ requirement for digitally signed drivers provides a safety net. It does raise the bar — but it does not close the Plug and Pwn gap entirely. Legitimate, signed driver packages that exist in the Windows Update catalogue or a corporate driver store can be abused if an attacker can steer Windows into installing them for a fake device. The signature validates the package’s origin and integrity, not its appropriateness for the connected hardware. This is why device installation restriction policies — not just signature enforcement — are the correct control.

The Broader Lesson: Windows Security Starts at the Perimeter

The Plug and Pwn research is a vivid reminder that perimeter-level thinking must extend to the physical layer. Network firewalls, strong passwords, and even BitLocker encryption do not protect against an attacker who can plug a malicious USB attack vector into an unguarded port and have Windows hand over SYSTEM privileges within seconds.

IT and security teams should treat any USB port on a corporate endpoint as a potential attack surface — because that is exactly what it is. Combine that mindset with the Group Policy and RDP controls outlined above, and you close the vast majority of the Plug and Pwn exposure without waiting for a vendor patch.

For organisations looking to maintain a locked-down, fully managed Windows estate, ensuring every machine runs a genuine, properly licensed copy of Windows is also foundational. A correctly licensed and activated Windows installation receives security updates reliably, without gaps or delays. You can explore Windows 11 Pro licences to keep your endpoints current and patch-ready — Windows 11 Pro also includes the most robust Group Policy toolset for implementing the device installation restrictions described above.

Frequently Asked Questions

What exactly are fake USB devices in the context of Plug and Pwn?

Fake USB devices are purpose-built or modified hardware units — or software-emulated virtual devices — that present a false hardware identity to Windows when connected. They mimic the device IDs of legitimate hardware to trigger Windows Plug and Play into installing a driver package chosen by the attacker. Unlike ordinary USB drives, they may carry no visible storage or function; their sole purpose is to manipulate the PnP subsystem.

Do I need to be physically present to carry out a USB privilege escalation attack?

Not necessarily. Researchers demonstrated a remote variant of the attack using USB device redirection over RDP. If an attacker has access to an RDP session — even with limited credentials — they can present a virtual fake USB device through that session and trigger the same SYSTEM-level driver installation chain. Disabling PnP device redirection in RDP settings is therefore a critical remote-attack mitigation.

Does Plug and Pwn affect Windows 11 specifically?

Yes. Both Windows 10 and Windows 11 are affected by the underlying Plug and Play design behaviour that the attack exploits. Windows 11 does introduce stricter hardware requirements and improved security defaults in some areas, but the PnP driver installation process that Plug and Pwn abuses is present and exploitable across both versions without specific hardening in place.

Will disabling USB ports protect against all malicious USB attacks?

Disabling or restricting USB ports removes the physical attack vector for the direct variant of Plug and Pwn, but it must be combined with RDP peripheral redirection controls to close the remote path. Additionally, disabling USB ports via Group Policy (device installation restrictions) is more granular and practical for most organisations than physically disabling ports, since it allows whitelisted devices like keyboards and mice to continue functioning.

Is there a Microsoft patch for this vulnerability?

Plug and Pwn exploits a design behaviour in Windows Plug and Play rather than a single discrete software bug with its own CVE in the traditional sense. Microsoft has acknowledged the research. Rather than waiting for a specific patch, organisations should implement the Group Policy restrictions, RDP controls, and endpoint hardening measures described in this article, which collectively mitigate the attack without depending on a single fix.

How does this relate to other USB-based Windows threats like BadUSB?

BadUSB-style attacks typically emulate keyboards or other human-interface devices to type commands in the context of the logged-in user. Plug and Pwn is distinct because it targets the SYSTEM-level driver installation process, bypassing user-level privilege entirely. The two attack classes can be used independently or in combination, but Plug and Pwn represents a more fundamental escalation path because it does not depend on user interaction or the user’s privilege level.

TPM chip piracy crackdown securing Windows activation with hardware trust
August 6, 2026

TPM Chip Piracy Crackdown: What Microsoft’s Move Means for You

Post By administrator Microsoft, Windows , , , , , No Comments

Microsoft’s TPM chip piracy crackdown is real, it’s rolling out now, and it fundamentally changes how Windows activation fraud is detected and blocked. If you manage a business network, run a KMS server, or you’re simply curious whether your Windows copy is genuine, this is essential reading.

What Is the TPM Chip Piracy Crackdown?

Diagram of TPM activation security flow for KMS Hardware-Secured Windows licensing

Microsoft has introduced a feature called KMS Hardware-Secured, which uses Trusted Platform Module (TPM) attestation to verify that a Key Management Service (KMS) host is running on genuine, uncompromised hardware before it can activate any Windows device. In plain terms: the activation server now has to prove it’s a real physical (or properly certified virtual) machine — not a software-spoofed imitation — before Microsoft’s licensing system accepts activation requests from it.

This is a meaningful escalation. Previously, piracy tools could mimic a KMS host entirely in software, tricking Windows into believing it was legitimately activated by a corporate volume-licensing server. TPM attestation closes that loophole by anchoring the entire chain of trust to a hardware root that cannot be faked in software alone.

According to Microsoft’s own IT Pro blog announcement, KMS Hardware-Secured is rolling out for Windows Server environments and will progressively become the required standard for KMS hosts.

How TPM Activation Security Actually Works

TPM activation security works by tying the identity of an activation server to a cryptographic certificate stored inside its TPM chip — a tamper-resistant piece of silicon soldered to the motherboard. Here’s the step-by-step flow:

  1. TPM attestation request: The KMS host generates a cryptographic proof using its TPM chip, demonstrating its hardware identity to Microsoft’s attestation service.
  2. Microsoft verification: Microsoft’s servers validate that proof. If the hardware is genuine and unmodified, verification succeeds.
  3. Activation rights granted: Only once the KMS host is verified does it receive permission to activate client machines on its network.
  4. Ongoing checks: The attestation is not a one-time event — the hardware integrity can be re-validated, making it much harder for a compromised host to continue operating undetected.

This is the same family of technology used in Windows Hello biometric sign-in and BitLocker drive encryption — both of which already depend on TPM hardware to store keys that cannot be exported or spoofed. Extending it to KMS activation was a logical next step.

Windows Piracy TPM: Why This Approach Is Different

TPM chip piracy crackdown versus software KMS spoof side-by-side comparison graphic

Previous anti-piracy measures focused on the software side — detecting known crack signatures, blacklisting activation keys, or invalidating product keys found in leaked databases. The Windows piracy TPM approach is different because it moves the trust anchor into hardware. Software can be patched, reverse-engineered, or replaced; a TPM chip cannot be trivially cloned or emulated at scale.

It’s worth noting that the piracy community has already begun adapting. A method called TSforge has reportedly emerged as a workaround, and in 2025 Microsoft closed the older “KMS38” loophole that had allowed activations to be spoofed until the year 2038. This is the usual cat-and-mouse cycle — but TPM-based attestation raises the technical floor significantly, meaning only more sophisticated attacks will have any chance of working, and those are far beyond the reach of casual piracy.

Does the KMS Piracy Block Affect Legitimate Users?

For the vast majority of home users with a retail or OEM Windows licence, the answer is no — this change does not affect you at all. Retail and OEM activations go through a completely separate pathway (HWID or online activation) that does not touch KMS. You won’t see any change in how your PC activates.

The groups who need to pay attention are:

  • Enterprise IT administrators running on-premises KMS servers for volume licensing. They will need to ensure their KMS host hardware has a TPM 2.0 chip and that TPM attestation is enabled and working.
  • Managed service providers (MSPs) running KMS infrastructure for clients. The same applies — hardware must be TPM 2.0 compliant.
  • Anyone currently using pirated volume activation. If your “KMS activator” is a software tool rather than a genuine licensed KMS server, this crackdown is specifically aimed at you.

IT Admins: What You Need to Do Now

IT admin verifying TPM 2.0 chip status for Windows KMS activation security compliance

If you manage a legitimate enterprise KMS environment, the action items are straightforward. Microsoft is not removing KMS — it is hardening it. Here’s what to check:

  • Verify TPM 2.0 is present and enabled on your KMS host server. In Windows, open the TPM Management console (tpm.msc) and confirm the chip is active and the specification version reads 2.0.
  • Update your KMS host software to the latest version that supports Hardware-Secured mode. Older KMS host installations will not be capable of completing TPM attestation.
  • Check virtual KMS hosts — if your KMS server runs in a VM, confirm that your hypervisor passes through vTPM support and that the guest OS can see a TPM 2.0 device.
  • Test attestation in a staging environment before the feature becomes mandatory in your Windows Server build.
  • Review your volume licensing agreement with Microsoft to ensure your client counts and activation scopes are still within compliance.

Organisations that already run modern, properly licensed infrastructure will find the transition largely painless. The heavy lifting falls on those running outdated or improperly configured KMS hosts.

TPM Activation Security and the Bigger Windows 11 Picture

This move makes more sense when you remember that TPM 2.0 has been a mandatory system requirement for Windows 11 since its launch in October 2021. Microsoft has spent years seeding TPM hardware across the global PC fleet — and now it is beginning to use that infrastructure for licensing enforcement, not just security features like BitLocker and Secure Boot.

In other words, the TPM requirement that frustrated so many users trying to upgrade to Windows 11 is now paying dividends from Microsoft’s perspective: nearly every Windows 11 machine in the world already has the hardware needed to participate in TPM-backed activation. The groundwork was laid quietly; the enforcement is only now becoming visible.

This also signals where Windows licensing is heading. Expect future versions of Windows to lean even more heavily on hardware attestation, making purely software-based licence bypasses increasingly impractical.

The Case for a Genuine Windows Licence

Beyond the technical risks of running pirated software — malware bundled in activation tools, missing security patches, sudden deactivation — the TPM chip piracy crackdown adds a new practical risk: your activation simply stops working as Microsoft closes each successive loophole. Chasing workarounds is a treadmill, not a solution.

A genuine Windows licence is a one-time purchase that delivers permanent, hardware-bound activation. At Buy Now Key, you can pick up a Microsoft Windows 11 Pro Retail licence for just €17.90 — a fraction of what most people spend on a monthly streaming subscription — or a full guide to all legal Windows activation methods is available on the blog if you want to explore every option before deciding.

For users who need both the OS and a productivity suite, there’s also a Windows 11 Pro + Office 2024 Professional Plus bundle available for €27.80 (regular price €37.85) — genuine, lifetime-activated, and delivered instantly.

FAQ: TPM Chip Piracy Crackdown

Will my currently activated Windows 11 Home or Pro installation stop working?

No. If you activated Windows 11 through a retail key, OEM licence, or a legitimate digital entitlement, your activation is not affected by the KMS Hardware-Secured changes at all. This change targets KMS volume activation servers, not individual retail or OEM devices. Your PC will continue to activate normally.

What is KMS and why do pirates use it?

Key Management Service (KMS) is Microsoft’s volume-licensing system designed for large organisations to activate many Windows machines internally without each one connecting to Microsoft’s servers individually. Piracy tools mimicked this system in software, creating fake KMS “servers” that tricked Windows into believing it was legitimately activated under a corporate licence. The TPM activation security changes specifically target these fake servers.

Does my home PC need a TPM 2.0 chip because of this?

Your home PC already needs TPM 2.0 to run Windows 11 — that requirement predates this change. The KMS Hardware-Secured feature applies to servers that act as KMS hosts, not to the client machines they activate. For home users, nothing changes in terms of hardware requirements.

Can pirates bypass the TPM chip piracy crackdown?

Technically sophisticated workarounds will likely emerge over time — the TSforge method is an early example — but TPM-based attestation raises the bar considerably. Casual or automated piracy using off-the-shelf activator tools will become much less reliable. Each successive bypass also becomes easier for Microsoft to detect and close, making piracy an increasingly unstable choice.

How do I check if my Windows licence is genuine right now?

Open Settings, go to System > Activation, and look for the status message. A genuine, properly activated copy will show “Windows is activated” along with your licence type. You can also run slmgr /xpr in an elevated Command Prompt for detailed licence expiry information. Our Windows licence check guide walks through exactly what each status message means.

Hotel WiFi Windows security warning alert on laptop screen
August 5, 2026

Hotel WiFi Windows Security: How to Stay Safe from Hackers

Post By administrator Microsoft, Windows , , , , , , No Comments

Hotel WiFi Windows security has never mattered more: Microsoft has officially linked a global wave of attacks — codenamed CaptiveCrunch — to Midnight Blizzard, a Russian state-sponsored threat group, that is hijacking hotel networks to steal Microsoft 365 logins and deploy custom malware on Windows PCs. If you travel with a laptop, this is a threat you need to understand today.

What Is the CaptiveCrunch Attack and Who Is Behind It?

Diagram showing hotel WiFi hackers hijacking Windows credentials via fake portal

CaptiveCrunch is a credential-theft and malware-delivery campaign attributed by Microsoft to Midnight Blizzard (also tracked as APT29 or Cozy Bear). Microsoft’s own security blog confirmed the campaign in July 2026, warning that attackers have compromised hotel WiFi infrastructure worldwide — targeting business travellers, government officials, and corporate guests staying in hospitality venues across multiple countries.

The group is not opportunistic. Midnight Blizzard is a sophisticated, state-backed unit with a long history of high-profile intrusions, and CaptiveCrunch represents one of its most operationally complex consumer-facing campaigns to date.

How Hotel WiFi Hackers Hijack Your Connection

The attack exploits the one moment every hotel guest accepts without thinking: the captive portal login page you see when you first connect to hotel WiFi. Here is the step-by-step flow attackers use:

  • DNS hijacking at the router level: Attackers compromise the hotel’s network equipment and redirect DNS queries, so that when your Windows PC requests any website, the router can intercept and reroute the traffic.
  • Fake Microsoft 365 sign-in page: The captive portal is replaced — or supplemented — with a convincing phishing page that mimics a legitimate Microsoft login screen. Credentials you type go straight to the attacker.
  • Fake Windows or browser update prompts: A second attack path presents a fraudulent software update notification. Accepting the update installs a custom malware payload directly onto your Windows machine.
  • Session-token theft to bypass MFA: Critically, the campaign is engineered to defeat standard multi-factor authentication. Rather than stealing passwords alone, the malware captures live authentication session tokens — meaning even an MFA-protected account can be taken over without the attacker ever knowing your password.

Once the malware lands on your device, its capabilities are alarming: keylogging, screenshot capture, microphone and webcam access, browser credential harvesting, and a remote shell that gives attackers ongoing access to your machine long after you check out of the hotel.

Warning Signs Your Windows PC May Be Compromised on Hotel WiFi

Windows travel security settings open on laptop in hotel room

Spotting WiFi credential theft in progress is difficult — that is by design. But there are red flags to watch for as soon as you connect to any hotel network:

  • A Microsoft 365 or Outlook login page appearing inside the hotel captive portal itself (legitimate portals ask for a room number or voucher code, not a Microsoft password).
  • A Windows Update or browser update prompt appearing immediately after connecting — updates should never initiate from a captive portal environment.
  • SSL certificate warnings or browser security alerts on pages you trust.
  • Unusually slow DNS resolution or pages loading from unexpected IP addresses (visible in your browser’s developer tools).
  • Your Microsoft 365 account showing sign-in activity from an unrecognised location shortly after your stay.

If any of these occur, disconnect immediately, change your Microsoft account password from a trusted network, and revoke all active sessions from the Microsoft account security dashboard.

Windows Travel Security: Immediate Steps Before You Connect

The most effective defence against hotel WiFi hackers is a layered approach — applied before you ever open your laptop in a hotel room. Here is what to do:

1. Use a Trusted VPN — Always

A reputable VPN encrypts your traffic before it leaves your device, making DNS hijacking and man-in-the-middle interception significantly harder. Enable your VPN before the captive portal login if your provider supports it, or connect the moment the portal grants access. Corporate VPNs provided by employers are preferred; if you travel privately, choose a provider with a verified no-logs policy and strong encryption standards.

2. Switch to FIDO2 / Passkey Authentication

Because CaptiveCrunch is specifically engineered to steal session tokens and bypass traditional MFA, the most resilient defence is moving away from password-plus-code authentication entirely. FIDO2 hardware security keys (such as a YubiKey) and Windows Hello passkeys bind authentication to your physical device, making stolen tokens useless to an attacker operating remotely. Microsoft supports passkeys natively across Microsoft 365 — enable them in your account security settings before your next trip.

3. Treat Every Hotel Network as Hostile

Windows 11 Pro includes a built-in network profile setting: when you join a new network, set it to Public, not Private. This disables network discovery and file sharing automatically. Additionally, ensure Windows Defender Firewall is active and your Windows Defender antivirus definitions are fully up to date before departure — not via a hotel network prompt.

4. Patch Windows Before You Travel, Not After

Run Windows Update at home on a trusted connection before every trip. Attackers leverage unpatched vulnerabilities; a fully updated Windows 11 system closes many of the lateral-movement vectors that CaptiveCrunch-style malware exploits once it lands on a device.

5. Enable BitLocker Drive Encryption

If your device is physically stolen during a trip — or seized at a border — BitLocker encryption ensures that your stored credentials, files, and cached Microsoft 365 tokens are unreadable without your recovery key. BitLocker is available on Windows 11 Pro. Our in-depth guide to the BitLocker bypass exploit and how to protect your Windows 11 device explains exactly which settings to harden.

Why Windows 11 Pro Is the Right OS for Travellers Concerned About Hotel WiFi Security

Windows 11 Pro security features protecting hotel WiFi Windows security

Not all Windows editions are equal when it comes to Windows travel security. Windows 11 Pro includes several enterprise-grade protections that Home edition lacks:

  • BitLocker full-disk encryption — critical if a device is lost or stolen.
  • Windows Defender Credential Guard — isolates authentication secrets in a virtualisation-based security container, limiting what malware can harvest from memory.
  • Remote Device Management (MDM/Intune) — allows IT teams to remotely wipe or lock a compromised device.
  • Advanced Audit Policies — detailed sign-in and access logs that help security teams detect compromise quickly.

If you are still running Windows 11 Home on a work machine used for travel, upgrading to Microsoft Windows 11 Pro gives you access to every one of these protections. At BuyNowKey, a genuine retail licence starts from just €17.90 — a small price against the cost of a credential breach.

Protecting Your Microsoft 365 Account on Hotel Networks

Your Microsoft 365 account is the primary target of hotel WiFi hackers. Beyond passkeys, take these account-level steps:

  • Review sign-in activity regularly: Visit account.microsoft.com/security and check recent sign-ins. Unrecognised locations or devices should trigger an immediate password reset.
  • Revoke all active sessions: After any trip where you connected to an untrusted network, sign out of all devices from the Microsoft account portal.
  • Enable login notifications: Microsoft can alert you by email or the Authenticator app whenever a new device signs into your account.
  • Use a dedicated travel account: Where possible, log into a limited Microsoft account with no admin privileges or sensitive SharePoint/OneDrive access when using hotel WiFi.

It is also worth auditing which apps have delegated access to your Microsoft 365 data — attackers who gain a valid session token can grant themselves persistent OAuth application access that survives a password reset.

What to Do If You Think You Were Already Targeted

If you connected to hotel WiFi recently and now suspect you may have been exposed to hotel WiFi hackers, act fast. The window between initial compromise and data exfiltration is often short.

  1. Disconnect from all networks immediately.
  2. Change your Microsoft 365 password from a trusted device on a trusted network.
  3. Revoke all active sessions and OAuth app permissions from the Microsoft account security portal.
  4. Run a full Windows Defender scan — or a second-opinion scan with Microsoft Safety Scanner.
  5. Notify your IT or security team if you are using a corporate device, as lateral movement to company infrastructure is a documented risk in CaptiveCrunch-style campaigns.
  6. Check your PC for unfamiliar scheduled tasks, startup entries, or newly installed software — signs of a persistent malware foothold. Our article on how to spot fake Windows apps and malware download sites covers key indicators to look for.

Frequently Asked Questions

Can hotel WiFi hackers steal my credentials even if I use MFA?

Yes. The CaptiveCrunch campaign specifically targets session tokens — the authentication cookies your browser stores after a successful sign-in — rather than just passwords. This allows attackers to bypass standard multi-factor authentication entirely. The best defence is switching to FIDO2 passkeys or hardware security keys, which bind the authentication proof to your physical device and cannot be replicated remotely.

Is a VPN enough to stay safe on hotel WiFi?

A VPN significantly raises the bar — it encrypts your traffic and defeats most DNS hijacking attacks. However, it is not a silver bullet. If you accept a fake update prompt from within the captive portal before your VPN connects, malware can still be installed. Layer a VPN with up-to-date Windows Defender, passkey authentication, and network awareness for the strongest protection.

Which Windows version offers the best protection for travellers?

Windows 11 Pro is the recommended choice for travellers who need strong Windows travel security. It includes BitLocker disk encryption, Credential Guard, and full MDM support — features absent from Windows 11 Home. Credential Guard in particular prevents malware from extracting cached authentication tokens from system memory, directly countering the CaptiveCrunch technique.

How do I know if my Microsoft 365 account was compromised via hotel WiFi?

Check your recent sign-in history at account.microsoft.com/security. Look for sign-ins from unfamiliar countries, IP addresses, or devices. Also review the list of apps with delegated access to your account — a compromised session can be used to grant a malicious third-party app persistent access that survives a password change. If anything looks suspicious, revoke all sessions and change your password immediately.

Do these hotel WiFi attacks only affect Windows PCs?

The CaptiveCrunch campaign as documented by Microsoft is primarily focused on Windows credential theft, using Windows-specific malware payloads. However, the phishing pages targeting Microsoft 365 logins are browser-based and will work regardless of operating system. Mac and mobile users should also avoid entering Microsoft credentials on hotel captive portals and should use a VPN on all devices.

Windows 11 PIN requirement lock screen with security shield icon
July 18, 2026

Windows 11 PIN Requirement: Why It’s Enforced and Your Real Options

Post By administrator Microsoft, Windows , , , , , , No Comments

The Windows 11 PIN requirement catches many users off guard: you sit down to log in with your familiar password and Windows refuses to move on without a PIN. This isn’t a bug or a mistake — Microsoft deliberately pushes users toward PIN-based sign-in as part of its Windows Hello security framework. Understanding exactly why this happens, what triggers it, and what you can legitimately do about it will save you a lot of frustration.

What Is the Windows 11 PIN Requirement, Really?

Infographic comparing Windows Hello PIN device binding versus network password transmission

The Windows 11 PIN is not the same as a classic numeric passcode. Under Windows Hello, a PIN is a device-bound credential backed by the Trusted Platform Module (TPM) chip on your machine. According to Microsoft’s official Windows Hello for Business documentation, the PIN never leaves the device, meaning an attacker who steals your Microsoft account password still cannot use it to unlock your specific PC remotely. That is the core of Microsoft’s security argument — the PIN’s strength comes from device-binding, not from the complexity of the digits themselves.

A traditional Microsoft account password, by contrast, is transmitted over the network during authentication and is theoretically phishable. Windows Hello’s PIN sidesteps that risk entirely because it only ever authenticates locally, verified by the TPM hardware.

Why Microsoft Enforces It on Windows 11

Microsoft’s push toward Windows Hello PIN authentication reflects a broader industry shift toward passwordless identity. Several factors drive the enforcement you see on-screen:

  • Microsoft account requirements: Windows 11 Home now requires a Microsoft account on first setup (as of 2022–2023 releases). Once tied to a Microsoft account, Windows Hello PIN setup becomes part of the onboarding flow.
  • Security baseline defaults: Microsoft’s default security baselines — which inform both consumer and enterprise builds — set PIN as the preferred primary authenticator.
  • Windows 11 24H2 policy changes: The 24H2 update tightened several account policies. Some users on the AskWoody forum reported that November 2024 updates silently reinstated the PIN prompt even on machines where it had been disabled.
  • Entra ID (Azure AD) join behaviour: Devices joined to Microsoft Entra ID are forced into Windows Hello for Business provisioning on first sign-in, which mandates a PIN as the first authentication factor.
  • TPM 2.0 hardware baseline: Windows 11 requires TPM 2.0 on all certified hardware. Microsoft designed Windows Hello PIN to leverage this chip, so the infrastructure is always present — making enforcement technically straightforward.

The PIN vs Password Windows Debate: Who Is Actually Right?

The PIN vs password Windows debate is genuinely nuanced. Microsoft’s position is well-founded from a phishing and credential-theft standpoint — a device-bound PIN cannot be replayed from another machine. However, critics raise legitimate counter-points:

  • A short numeric PIN (4–6 digits) has far less entropy than a long, complex password — important if someone can physically access your machine.
  • Biometric fallback (face/fingerprint) can sometimes be bypassed by determined attackers with physical access, reintroducing risk at the device level.
  • For shared workstations or kiosk-style deployments, a PIN model may not fit the operational workflow.
  • Power users who already use password managers and long passphrases may see zero net benefit from switching.

The honest answer: for the average home user on a personal laptop, a Windows Hello PIN is genuinely safer against the most common threats (phishing, credential stuffing). For enterprise edge cases or shared machines, the calculus changes.

When Does the Windows 11 PIN Prompt Appear?

Windows 11 Settings accounts panel showing PIN requirement sign-in options

The PIN prompt does not appear in every situation. These are the most common triggers:

  • First-time setup of a new Windows 11 device with a Microsoft account
  • After a major feature update (especially 24H2) resets sign-in preferences
  • When a device is enrolled in Microsoft Entra ID or a corporate MDM (Mobile Device Management) solution
  • After certain monthly cumulative updates that refresh security policy baselines
  • When Windows detects the existing credential provider has become stale or corrupted

Your Actual Options for Managing the Windows 11 PIN Requirement

Here is the practical reality: Microsoft has made it progressively harder to remove the Windows 11 PIN entirely, but you do have options depending on your account type and edition.

Option 1: Switch to a Local Account (Home & Pro)

The most reliable way to eliminate the PIN prompt on a personal machine is to disconnect from your Microsoft account and use a local account instead. Go to Settings → Accounts → Your info and choose Sign in with a local account instead. Local accounts are not subject to the same Windows Hello onboarding flow. The trade-off: you lose OneDrive sync, Microsoft Store purchasing under your account, and some Copilot features.

Option 2: Use Group Policy (Windows 11 Pro and Enterprise Only)

On Windows 11 Pro and Enterprise, administrators can disable the Windows Hello PIN prompt through Group Policy. Navigate to Computer Configuration → Administrative Templates → Windows Components → Windows Hello for Business and set Use Windows Hello for Business to Disabled. This prevents Windows from provisioning Hello credentials on that machine. Note that this setting applies machine-wide — all users on that device are affected.

Option 3: MDM / Intune Policy (Business Deployments)

For IT administrators managing fleets of Entra ID-joined devices, the correct lever is Microsoft Intune. Under Endpoint security → Account protection, you can set the Windows Hello for Business policy to Disabled or configure specific PIN complexity and length requirements if you want to keep Hello but tailor it to your environment. This is the supported, scalable approach — not a workaround, but the proper enterprise control plane.

Option 4: Registry Edit (Advanced Users, All Editions)

A registry edit can suppress the PIN setup prompt on Windows 11 Home where Group Policy is unavailable. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\PassportForWork and create a DWORD value named Enabled set to 0. This mimics the Group Policy setting at the registry level. Back up your registry before making any edits — an incorrect change can destabilise Windows sign-in.

Option 5: Tolerate It and Use a Strong PIN

For many users the pragmatic answer is simply to set a strong alphanumeric PIN (Windows allows letters and symbols, not just digits). An alphanumeric PIN of 10+ characters combines the phishing-resistance of device-binding with the entropy of a traditional password — giving you the best of both worlds without fighting the OS.

Windows 11 PIN Requirement in Business Environments

IT admin configuring Windows Hello PIN policy in Microsoft Intune dashboard

The business impact of the enforced Windows Hello PIN policy is significant. Organisations that joined devices to Entra ID before fully understanding Windows Hello for Business provisioning have found that end-users are prompted to set a PIN on every first sign-in to a new device — even when IT intended password authentication to remain the primary method. Microsoft’s recommended resolution is to explicitly configure the Windows Hello for Business policy in Intune rather than leaving it in a default state, which can vary between tenants.

If your business runs on Windows 11 Pro and you are managing sign-in policies, it is worth auditing your edition choice. Windows 11 Pro provides Group Policy access that Home does not, making it significantly easier to enforce consistent authentication standards across a small business without a full Intune deployment. Licences from Buy Now Key for Microsoft Windows 11 Pro – Retail are available from €17.90 and deliver a genuine lifetime activation key, letting you access those advanced policy controls immediately.

Does Removing the PIN Weaken Your Security?

Removing the Windows Hello PIN and relying solely on a Microsoft account password reintroduces network-based authentication risk. Microsoft’s own data — cited internally — notes that accounts protected by Windows Hello are significantly less susceptible to phishing attacks than those using password-only sign-in, because the credential never traverses the network. If you do remove the PIN, compensate with a very strong, unique Microsoft account password and multi-factor authentication on the account itself (via the Microsoft Authenticator app). That way, even if your password is compromised, your account remains protected.

What to Do If Windows 11 Keeps Re-Enabling the PIN Prompt

Several users on the Microsoft Tech Community forum report that Windows 11 reinstates the PIN prompt after updates, even when it was previously disabled. This is most often caused by a cumulative update resetting the PassportForWork registry key or refreshing MDM policy. The reliable fix for managed devices is to enforce the policy through Intune or Group Policy rather than a manual registry edit, so the policy is reapplied on every startup. For home users, re-applying the registry edit after major updates — or simply switching to a local account — remains the most durable solution.

FAQ

Why is Windows 11 forcing me to use a PIN even though I never wanted one?

Windows 11, especially when configured with a Microsoft account, treats PIN setup as a default security step during onboarding and after certain updates. Microsoft designed Windows Hello PIN as the preferred authentication method because a PIN is device-bound and cannot be phished remotely. Feature updates — particularly the 24H2 release — have tightened these defaults, so even users who previously dismissed the prompt may see it reappear after updating.

Can I completely remove the PIN requirement on Windows 11 Home?

Yes, but the options are limited compared to Pro. The most reliable method on Home is to switch to a local account, which removes your device from the Microsoft account authentication flow entirely. Alternatively, a registry edit under HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\PassportForWork (DWORD Enabled = 0) can suppress the prompt, though this may be reset by future updates.

Is a Windows Hello PIN actually more secure than a password?

For most users, yes — but for a specific reason. The PIN is bound to your physical device and verified by the TPM chip, meaning it cannot be used on any other machine. A stolen Microsoft account password can be used anywhere; a stolen PIN is useless without the physical device. However, a short numeric PIN has lower entropy than a long passphrase, so if someone has physical access to your machine, a strong alphanumeric PIN or biometric lock is advisable.

How do IT admins stop Windows Hello PIN prompts for Entra ID-joined devices?

The correct approach is to configure the Windows Hello for Business policy in Microsoft Intune. Under Endpoint security → Account protection, set the Windows Hello for Business toggle to Disabled for the relevant device group. This is a supported, managed configuration and will persist across updates, unlike manual registry edits applied on individual machines.

Will Microsoft ever make the Windows 11 PIN requirement optional by default again?

Microsoft’s direction is clearly towards passwordless authentication, not away from it. With Windows 11 and the continued expansion of Windows Hello for Business, enforced PIN or biometric sign-in is likely to become more prevalent, not less. Users who genuinely prefer passwords should plan to use a local account or implement a formal Group Policy/MDM exemption rather than expect a future rollback of these defaults.

Windows Defender disk space vulnerability critical security alert warning concept
July 11, 2026

Windows Defender Disk Space Vulnerability: What the July 2026 Patch Fixes

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The Windows Defender disk space vulnerability patched in July 2026 is one of the most disruptive security flaws to hit Windows in recent memory — and it affects virtually every Windows 10 and Windows 11 machine running Microsoft’s built-in antivirus. Tracked as CVE-2026-33825, the bug allowed remote attackers to abuse Defender’s own scanning engine to flood a target’s hard drive with junk data until the disk was completely full, effectively making the system unusable. Here is exactly what you need to know, what the patch fixes, and how to confirm your PC is protected.

What Is the Windows Defender Disk Space Vulnerability?

Windows Defender disk space vulnerability diagram showing engine writing excessive data

CVE-2026-33825 is a privilege escalation and denial-of-service flaw rooted in insufficient granularity of access control within the Microsoft Malware Protection Engine — the core scanning component that powers Windows Defender. Researchers at multiple threat intelligence firms, including those who follow the threat actor cluster dubbed BlueHammer, confirmed that the flaw was being actively exploited in the wild before Microsoft’s patch landed.

The attack chain works like this: a remote attacker tricks Defender’s real-time protection engine into logging an extremely large volume of diagnostic or quarantine data. Because the engine runs with elevated system privileges, it can write this data without the normal disk-space guardrails that apply to regular user processes. Left unchecked, the process fills every available byte on the system drive — bringing the PC to a standstill. No disk space means Windows cannot write page files, update system logs, or even save documents, effectively locking the user out.

  • Vulnerability ID: CVE-2026-33825
  • Component affected: Microsoft Malware Protection Engine
  • Attack type: Remote-triggered privilege escalation + disk exhaustion
  • Platforms at risk: Windows 10 (all supported builds) and Windows 11
  • Severity: Critical — CVSS score published on the NVD reflects elevated risk due to active exploitation
  • Patch released: July 2026 (out-of-band security update)

Why the Defender Disk Flaw Is Particularly Dangerous

Most security vulnerabilities require an attacker to already have local access to the machine, but this Defender disk vulnerability could be triggered remotely — making it far more threatening for home users and businesses alike. The fact that the exploit weaponises a security tool itself against the system it is meant to protect is a recurring and particularly nasty attack pattern.

What made this Defender disk space bug especially problematic is that Defender’s real-time protection is on by default on every Windows installation that doesn’t have a third-party antivirus active. That means the attack surface was enormous. According to StatCounter, Windows holds roughly 72% of global desktop OS market share as of mid-2026, and the vast majority of those machines run Defender as their primary security layer. Even users who believed they were safe because they kept Windows updated were exposed until Microsoft pushed the fix.

There is also the stealth factor. A disk-fill attack triggered via Defender generates no obvious malware alert — because Defender itself is doing the writing. By the time a user notices the system grinding to a halt, the drive may already be at 100% capacity.

Who Was at Risk from the Windows Defender Flaw?

Any device running a version of the Microsoft Malware Protection Engine prior to 1.1.26060.x (the patched engine version released in July 2026) was potentially at risk. In practical terms, that meant:

  • All Windows 10 users on supported builds (22H2 and later) with Defender enabled
  • All Windows 11 users — including those on 23H2 and 24H2 — who had not yet received the out-of-band engine update
  • Enterprise environments using Microsoft Endpoint Protection or Microsoft Security Essentials, which share the same engine
  • Systems where Defender was in passive mode alongside a third-party AV, since the Protection Engine still receives definition updates and remained partially active

Users running fully third-party antivirus solutions with Defender completely disabled were largely shielded, but this represented a small fraction of the Windows user base.

What the Patch Actually Fixes

Windows Defender flaw patch verification screen showing updated engine version

Microsoft’s July 2026 out-of-band update addresses the Windows Defender disk space vulnerability by implementing stricter access controls around how the Malware Protection Engine writes diagnostic, quarantine, and log data. Specifically, the patch:

  1. Adds disk-write quotas to Defender’s engine processes, capping the total data any single scan or quarantine event can write to disk in a defined timeframe.
  2. Restricts the privilege level under which certain logging operations run, preventing the engine from bypassing standard OS disk-space guardrails.
  3. Improves input validation on scan triggers, so a crafted remote payload can no longer cause the engine to enter an unbounded write loop.

Alongside CVE-2026-33825, the same update also addressed a related privilege escalation bug tracked as CVE-2026-41091, which affected Microsoft Malware Protection Engine version 1.1.26030.3008 and allowed attackers to gain administrative control even when real-time protection appeared to be functioning normally. Patching both simultaneously was the right call.

For background on how Microsoft’s Malware Protection Engine underpins Defender’s scanning capabilities, Microsoft’s official Defender documentation provides a clear technical overview of the engine architecture and how automatic updates work.

How to Verify Your System Is Protected Against the Defender Disk Space Bug

Checking whether the Defender disk space bug patch has been applied is straightforward — you just need to confirm your engine version. Follow these steps:

  1. Open Windows Security from the Start menu or system tray.
  2. Click Virus & threat protection, then scroll down to Virus & threat protection updates.
  3. Click Check for updates and allow any pending definition and engine updates to install.
  4. Return to that screen and click Protection updates. Look for the Antimalware Client Version and the Engine Version.
  5. Confirm the Engine Version reads 1.1.26060.x or higher. If it does, the CVE-2026-33825 patch is applied.

Alternatively, open PowerShell as Administrator and run:

Get-MpComputerStatus | Select-Object AMEngineVersion, AMProductVersion

The AMEngineVersion field will show the currently installed engine version at a glance. Any version at or above 1.1.26060 confirms you are protected.

What to Do If You Are Still Vulnerable

Windows Defender disk space bug impact compared across Windows 10 and Windows 11

If your engine version is below the patched threshold, take these steps immediately:

  • Force a Windows Update: Go to Settings → Windows Update → Check for updates. Install all pending updates, including optional security updates.
  • Manually trigger a Defender update: Open Windows Security → Virus & threat protection → Protection updates → Check for updates.
  • Check your internet connection: Defender pulls engine updates automatically, but a broken connection or metered network setting can silently block them.
  • Temporarily monitor disk usage: Open Task Manager and keep an eye on disk write activity from MsMpEng.exe (the Defender engine process). Abnormally high sustained writes are a red flag.
  • Contact your IT department if you are on a corporate device — enterprise environments may manage Defender engine updates through WSUS or Microsoft Endpoint Configuration Manager on a separate schedule.

Is Windows 11 Safer Than Windows 10 Against This Defender Flaw?

Both Windows 10 and Windows 11 were equally vulnerable to this specific Windows Defender flaw because the attack targets the shared Malware Protection Engine, not OS-level architecture differences. However, Windows 11 does include additional hardware-rooted security features — such as TPM 2.0 enforcement, Secure Boot, and Virtualization-Based Security (VBS) — that can limit the blast radius of other exploit types. For this particular bug, those features offered no meaningful protection.

That said, keeping your OS on its most current version is always sound practice. If you are still on Windows 10 and thinking about upgrading, our Windows 11 Pro licence category has options from as little as €12.90 — a small investment compared to the cost of a compromised or unusable system.

For those who want to understand compatibility before committing, we also have a dedicated guide on checking Windows 11 system requirements before you upgrade — worth reading if your hardware is a few years old.

Broader Lessons from the Windows Defender Disk Space Vulnerability

The CVE-2026-33825 episode reinforces a truth that security professionals repeat but many users still underestimate: security software is itself an attack surface. The same elevated privileges that allow Defender to intercept and neutralise threats are the very reason a flaw in Defender can cause such catastrophic damage. Antivirus products from every vendor have faced similar issues over the years — this is not a reason to abandon Defender, but it is a reason to treat its updates with the same urgency you give OS-level patches.

Key takeaways for any Windows user:

  • Automatic updates should be on at all times — engine definition updates arrive independently of monthly Patch Tuesday cycles, and the gap between vulnerability disclosure and patch deployment is exactly when attackers strike.
  • Monitor your disk usage periodically. A drive filling up with no obvious cause is a reliable early warning signal of either a disk-related exploit or a rogue process.
  • Consider layered security. Defender provides a solid baseline, but pairing it with good browsing habits, a hardware firewall, and regular system backups significantly raises the bar for any attacker.
  • Stay informed. Out-of-band updates like the one addressing this flaw are rare and published in Microsoft’s Security Response Center — bookmarking it costs nothing and could save you a disaster.

Frequently Asked Questions

What exactly is the Windows Defender disk space vulnerability (CVE-2026-33825)?

CVE-2026-33825 is a flaw in Microsoft’s Malware Protection Engine — the scanning core shared by Windows Defender, Microsoft Security Essentials, and Endpoint Protection — that lets a remote attacker cause Defender to write unlimited data to your hard drive. The result is a completely full disk, which prevents the system from operating normally. Microsoft released an out-of-band patch in July 2026 to fix it.

Does the Defender disk space bug affect Windows 10 only, or Windows 11 too?

Both are affected. The vulnerability lives in the Malware Protection Engine, which is shared across Windows 10 and Windows 11. Neither OS version provides inherent protection against this specific flaw — only applying the engine update (version 1.1.26060 or higher) resolves it.

How quickly does Windows Defender update its engine automatically?

Defender engine and definition updates are typically delivered within hours of release via Windows Update and Microsoft Update servers. However, the update can be delayed on metered connections, managed enterprise environments, or devices with Windows Update paused. This is why manually checking for updates immediately after a critical advisory is always a good idea.

Can I tell if my disk was already attacked before I patched?

If your system drive filled up unexpectedly around July 2026 with no obvious cause, and disk write activity from MsMpEng.exe was unusually high, there is cause for concern. Run a full Defender scan after patching, check Windows Event Viewer under Windows Logs → Application for Defender-related errors, and consider running the Windows Disk Cleanup tool to reclaim space before investigating further.

Should I switch from Windows Defender to a third-party antivirus because of this flaw?

Not necessarily. Every major antivirus product has had critical vulnerabilities over the years — this is not unique to Defender. Defender’s integration with Windows, its automatic engine updates, and its zero additional cost make it a strong baseline for most users. What this incident highlights is the importance of keeping auto-updates enabled and monitoring your system health, regardless of which AV you use.

Is there a known CVE number for the related privilege escalation bug mentioned alongside CVE-2026-33825?

Yes — the companion vulnerability is tracked as CVE-2026-41091. It is a separate privilege escalation flaw in the same Microsoft Malware Protection Engine that allowed attackers to gain administrative control even when real-time protection appeared operational. Both CVE-2026-33825 and CVE-2026-41091 were addressed together in Microsoft’s July 2026 out-of-band security update.

Windows 11 Pro deals showing OEM and Retail licence comparison with security badges
June 29, 2026

Windows 11 Pro Deals: OEM vs Retail and How to Spot Safe Discounts

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The best Windows 11 Pro deals can save you a significant amount versus Microsoft’s full retail price — but only if you know what you’re buying. Cheap listings flood search results and marketplaces daily, and not all of them deliver a legitimate, working activation key. This guide cuts through the noise: we explain the real difference between OEM and Retail licences, flag the warning signs of grey-market resellers, and show you exactly how to verify that your Windows 11 licence is the real deal.

What Do Windows 11 Pro Deals Actually Include?

Infographic comparing Windows 11 Pro licence types Retail OEM and Volume

When you buy a Windows 11 Pro key online, you’re purchasing a 25-character alphanumeric product key that unlocks the operating system on one device. What changes between vendors is the licence type attached to that key — and that type determines how flexible and secure your purchase actually is.

There are three main licence categories you’ll encounter when shopping for a cheap Windows 11 Pro copy:

  • Retail — Sold by Microsoft directly or authorised retailers. Transferable between devices, linkable to a Microsoft account, and backed by full Microsoft support.

  • OEM (Original Equipment Manufacturer) — Traditionally bundled with new PCs by manufacturers. Tied to the first device it’s activated on and not intended to be transferred to new hardware.

  • Volume Licensing — Designed for businesses with multiple machines. Not intended for individual consumer sale; reselling these keys to end users is a grey-market practice.

According to Microsoft’s official Q&A documentation, OEM versions are tied to the first computer they’re installed on and cannot be transferred, while Retail versions give you the freedom to move the licence to new hardware. Understanding this distinction is the first step to shopping safely.

OEM vs Retail Windows 11 Pro: Which Licence Should You Choose?

The right licence type depends entirely on how you plan to use it. Here’s a straightforward breakdown:

Choose a Retail Windows 11 Pro Licence If You:

  • Are upgrading an existing PC and may want to transfer the key to a new build later

  • Want your licence linked to your Microsoft account for easy recovery

  • Require full Microsoft telephone support for activation issues

  • Need the most flexibility for long-term use

Choose an OEM Windows 11 Pro Licence If You:

  • Are building a brand-new PC that won’t change its core hardware for years

  • Want the lowest possible upfront cost for a permanent, lifetime activation

  • Are a system builder fitting out one or more new machines

  • Don’t need to transfer the licence to a different device

At BuyNowKey, you can pick up a Microsoft Windows 11 Pro OEM licence for just €12.90 — a lifetime activation for one device. If you’d prefer the full flexibility of a Retail copy, the Microsoft Windows 11 Pro Retail licence is available from €17.90, still a fraction of the cost of a boxed copy from a high-street store.

Why Do Windows 11 Pro Deals Vary So Wildly in Price?

You’ve probably noticed that Windows 11 Pro key prices range from under €5 to over €200. That enormous gap isn’t random — it reflects the source and legality of the key being sold.

  • €150–€260+: Microsoft Store full Retail price. You get full support, guaranteed authenticity, and easy licence transfers.

  • €12–€25: Legitimate OEM or discounted Retail keys from authorised resellers. Genuine keys, correctly classified, with transparent descriptions of what you’re getting.

  • Under €5: Almost always Volume Licensing keys sold without authorisation, stolen keys, or keys purchased with stolen payment details. These activate initially but are frequently revoked by Microsoft, leaving you with an unactivated system.

The sweet spot for safe Windows 11 Pro deals sits in that middle band — and that’s exactly where BuyNowKey operates. Prices below €5 should be an immediate red flag, not a bargain.

How to Spot a Grey-Market or Risky Windows 11 Licence

Windows 11 Pro key verification using slmgr command in Command Prompt

Not every discounted Windows 11 license listing is a scam, but knowing what red flags to look for protects your investment and your system.

Warning Signs of a Grey-Market Windows 11 Key

  • No licence type stated — Legitimate sellers always specify Retail or OEM clearly. Vague listings like “genuine key” with no further detail are suspicious.

  • Price below €5 — At this price point, the key is almost certainly a leaked Volume licence or one purchased with fraudulent payment details.

  • No refund or support policy — Reputable resellers stand behind their keys. If there’s no stated support or dispute process, walk away.

  • Marketplace listings with no business identity — Random eBay or Amazon Marketplace sellers with no reviews, no brand name, and no contact details.

  • Keys delivered via a screenshot or social media message — Legitimate vendors use automated, secure email delivery systems.

  • No way to verify activation post-purchase — Good resellers give you a clear path to confirm activation and offer support if something goes wrong.

Green Flags That Signal a Safe Windows 11 Pro Deal

  • Licence type (OEM or Retail) stated explicitly in the product listing

  • Transparent pricing above the grey-market floor (generally €10+)

  • Secure checkout, real business contact details, and a clear returns/support policy

  • Instant encrypted email delivery of the key

  • Positive verified customer reviews

How to Verify Your Windows 11 Licence After Activation

Once you’ve activated your Windows 11 Pro key, it takes less than a minute to confirm everything is above board. Here’s how:

  1. Open Settings → System → Activation. A genuine Retail key will show “Digital licence linked to your Microsoft account”.

  2. Press Win + R, type cmd, and run: slmgr /dlv. This command shows your full licence description, type (OEM, Retail, or Volume), and activation status.

  3. If the Description field shows “VOLUME_KMSCLIENT” but you paid for a Retail or OEM key, you’ve received a Volume licence — contact the seller immediately.

  4. Check the Activation Status field — it should read “Licensed”, not “Notification” or “Out-of-tolerance grace period”.

Running slmgr /dlv in Command Prompt is the fastest, most reliable method to verify any Windows 11 license — the output is detailed, unambiguous, and pulled directly from Microsoft’s activation servers.

OEM Bulk Deals: A Smart Option for Builders and IT Teams

If you’re equipping multiple machines, look for OEM multi-licence options. BuyNowKey’s Windows 11 Pro OEM 2-PC bundle starts at €12.50 per key — each activating one device permanently. For IT administrators or small businesses rolling out new workstations, this is one of the most cost-effective cheap Windows 11 Pro options available, without compromising on legitimacy.

Bulk OEM purchasing is a well-established practice for system builders. The key is sourcing from a reseller who clearly states the key type, provides support, and has a verifiable track record — not an anonymous marketplace listing promising the same product for €2.

Windows 11 Pro Deals: What You Get Beyond the OS

Beyond the licence itself, Windows 11 Pro includes a meaningful feature set that justifies the small premium over Windows 11 Home. Pro unlocks BitLocker drive encryption, Windows Sandbox, Remote Desktop, Hyper-V virtualisation, and domain join capabilities — all features that matter to professionals, home-office users, and small business owners. If you’re comparing licence types across editions, BuyNowKey’s guide on Windows 11 Pro vs Home breaks down every key difference so you can buy the right edition first time.

Bundle Deals: Even Better Value Than a Standalone Windows 11 Pro Key

If you need both a new OS and a productivity suite, combination bundles offer excellent value. At BuyNowKey you can get a Windows 11 Pro + Office 2021 Professional Plus bundle for just €36.80 (regularly €46.80) — that’s two lifetime licences for the price most retailers charge for Office alone. Both licences are clearly identified, instantly delivered, and backed by BuyNowKey’s customer support team.

Frequently Asked Questions

Are cheap Windows 11 Pro deals actually legal?

They can be, yes — but only when the licence type matches the legal channel for that key. OEM keys sold to system builders or individual PC builders are legitimate. Retail keys sold by authorised resellers at a discount are legal. The illegal grey-market keys are Volume Licensing keys sold to end consumers, or keys obtained through fraudulent means. Always confirm the licence type before purchasing.

What happens if my Windows 11 Pro key gets deactivated?

If Microsoft revokes a key — typically because it was a Volume licence sold outside its authorisation, or was purchased with stolen payment details — your system will enter “Notification mode,” displaying a watermark and limiting some personalisation settings. The system itself remains functional, but you’ll need a replacement legitimate key to restore full activation. This is why buying from a reseller with a support policy matters.

Can I transfer an OEM Windows 11 Pro licence to a new PC?

Officially, OEM licences are tied to the first device they activate on and are not intended to be transferred. Retail licences, by contrast, can be deactivated on one machine and reactivated on another. If you think you’ll be changing hardware in the near future, a Retail licence is the better investment, even at a slightly higher price point.

How do I know BuyNowKey’s Windows 11 Pro deals are genuine?

BuyNowKey clearly states the licence type (OEM or Retail) on every product listing, delivers keys securely via encrypted email, and provides customer support for activation issues. You can also verify any key yourself in under a minute using the slmgr /dlv command in Windows — legitimate keys show the correct licence channel and an active “Licensed” status with no surprises.

Is a Windows 11 Pro Retail key worth the extra cost over OEM?

For most home PC builders who don’t plan to change their hardware frequently, an OEM key offers excellent value — it’s permanent, genuine, and significantly cheaper than a boxed Retail copy. If you build or upgrade PCs regularly, or want your licence linked to your Microsoft account for easy recovery across hardware changes, a Retail key is worth the modest additional spend. At BuyNowKey, the price gap between the two is small enough that you can make the right choice for your needs without breaking the budget either way.

Windows laptop setup 2026 showing first boot configuration screen
June 26, 2026

Windows Laptop Setup 2026: The No-Fluff First-Hour Guide

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A proper Windows laptop setup in 2026 can be done in under an hour — if you know which steps matter and which defaults you can safely skip. Whether you’ve just unboxed a brand-new machine or performed a clean reinstall, this guide gives you a straight-line path from first boot to a fast, secure, and productive desktop.

Step 1: Begin Your Windows 11 Setup at the Out-of-Box Experience (OOBE)

Windows 11 setup OOBE account selection screen showing sign-in options

The first screen you see is Microsoft’s OOBE — the setup wizard that guides you through language, region, and account creation. In 2026, Windows 11 strongly pushes a Microsoft Account sign-in, and for most people that’s the right call: it unlocks BitLocker device encryption, syncs settings across machines, and ties into Windows Hello. However, if you’re setting up a business workstation that uses a domain or Azure Active Directory, skip the personal Microsoft Account at this stage and join the domain instead.

  • Personal use: Sign in with your Microsoft Account to enable device encryption and seamless OneDrive backup.

  • Work/IT use: Choose “Set up for work or school” to connect Azure AD or a local domain.

  • Privacy-first users: A local account remains possible via the OOBE command-line bypass, though Microsoft has tightened this in recent Insider builds.

Before you click past it, turn off every optional telemetry, advertising ID, and location-sharing toggle on the privacy screens. These are on by default; switching them off now saves you hunting through Settings later.

Step 2: Run Windows Update — All of It

Your new Windows 11 setup almost certainly shipped with an older build. Microsoft released the KB5089549 cumulative update on 12 May 2026, patching over 120 vulnerabilities — you want those fixes before you do anything else online. Go to Settings > Windows Update > Check for updates and install everything, including optional driver updates. Expect at least one reboot. Then check again — Windows often staggers updates across multiple passes.

While you’re in Settings, flip to Windows Update > Advanced options > Receive updates for other Microsoft products and toggle that on. This ensures Office, Edge, and other Microsoft software update through the same channel, so nothing gets left behind.

Step 3: Choose the Right Edition Early in Your Windows Laptop Setup

Windows laptop setup edition comparison Home versus Pro key features

If your machine came without a licence key, or you performed a clean install, now is the time to decide between Windows 11 Home and Windows 11 Pro. For the majority of home users and freelancers, Home covers everything. Pro is worth the upgrade if you need BitLocker full-disk encryption management, Remote Desktop hosting, Hyper-V virtual machines, or Group Policy control. At Buy Now Key, a Microsoft Windows 11 Pro – Retail licence is available from €17.90 — a one-time purchase with lifetime activation, no annual subscription required. If you want the OS and a full productivity suite together, the Windows 11 Pro & Office 2021 Professional Plus bundle brings both for €36.80, saving you over €10 compared to buying separately.

Step 4: Activate Windows and Verify

After entering your licence key, head to Settings > System > Activation and confirm the status reads “Windows is activated with a digital licence.” If activation fails, ensure you’re running the correct edition that matches the key — a Pro key won’t activate a Home installation without a feature upgrade. Microsoft’s official activation troubleshooter at Microsoft Support walks through every known error code.

Step 5: Harden Security Settings During Your Windows Setup

New Windows setup security checklist icons BitLocker Hello device encryption

A new Windows setup is at its most vulnerable before security layers are in place. Work through this checklist before you browse or install anything else.

Enable BitLocker (Pro) or Device Encryption (Home)

On Pro, go to Control Panel > BitLocker Drive Encryption and turn it on for your system drive. On Home, check Settings > Privacy & Security > Device encryption — if the toggle exists, switch it on. Either way, save your recovery key to your Microsoft Account or print it. Losing this key means losing access to your data permanently.

Set Up Windows Hello

Windows Hello — facial recognition or fingerprint sign-in — is faster and more secure than a typed password. Go to Settings > Accounts > Sign-in options and enrol your face or fingerprint. You’ll still set a PIN as a fallback; make it at least 6 digits.

Review App Permissions

Under Settings > Privacy & Security, audit which apps have access to your camera, microphone, location, and contacts. Revoke access for any app that doesn’t need it. Pre-installed OEM software is a common offender here.

Turn On Find My Device

Navigate to Settings > Privacy & Security > Find my device and enable it. This is the single step most people skip and most regret when a laptop goes missing.

Step 6: Remove the Bloatware

OEM manufacturers and Microsoft itself ship software you’ll never use. A clean set up Windows PC routine means going to Settings > Apps > Installed apps and uninstalling anything you don’t recognise or want — games, trial antivirus suites, media players, and manufacturer utilities that phone home in the background. Also open the Start menu, right-click pinned tiles for apps like TikTok or Candy Crush, and choose Uninstall. This frees RAM, reduces background CPU usage, and shrinks your attack surface.

For a deeper clean, the free tool Winget (built into Windows 11) lets you list and remove packages from the command line in bulk. Run winget list in an elevated PowerShell window to see everything installed, then winget uninstall <package-id> for anything you want gone.

Step 7: Install Your Essential Software Stack

With a clean base in place, install software purposefully rather than by habit. A practical 2026 stack for most users looks like this:

  • Browser: Firefox or Brave for privacy; Edge if you stay in the Microsoft ecosystem. Install uBlock Origin immediately.

  • Productivity suite: Office 2021 Professional Plus gives you Word, Excel, PowerPoint, Outlook, and more with a one-time licence — no Microsoft 365 subscription needed. Buy Now Key stocks it from €19.10 for an OEM key.

  • Password manager: Bitwarden (free, open-source) or 1Password. Do not reuse passwords across sites.

  • Backup solution: Windows Backup (built-in) for system images; a cloud solution like Backblaze or OneDrive for document versioning.

  • PDF reader: The built-in Edge reader handles most tasks, but Sumatra PDF is a lightweight alternative with no telemetry.

  • Communication: Teams (if your organisation uses it) or Signal for personal messaging.

Use Winget to install most of these in one go: winget install Bitwarden.Bitwarden, for example, pulls the latest verified version directly from the Windows Package Repository.

Step 8: Configure Performance and Power Settings

Windows 11 ships in Balanced power mode, which is fine for battery-powered laptops but throttles desktop machines unnecessarily. On a plugged-in desktop or a laptop you mainly use docked, switch to High Performance or Best Performance under Settings > System > Power.

Also disable startup programmes you don’t need: open Task Manager (Ctrl+Shift+Esc), go to the Startup apps tab, and disable everything with a high startup impact that you don’t actually need at boot. Spotify, Discord, and Teams are common culprits that add 5–15 seconds to your boot time each.

Step 9: Set Up Backup Before You Need It

The most overlooked step in any Windows laptop setup guide is backup — and yet it’s the one that saves you when everything else goes wrong. In 2026, a practical two-layer backup strategy means: OneDrive (or another cloud service) for documents and photos with continuous sync, and a periodic local image backup to an external drive using Settings > System > Storage > Backup options. Set the local backup to run weekly at minimum. If you’ve enabled BitLocker, your backup drive should also be encrypted.

Step 10: Run Final Windows Setup Checks Before You Start Working

Before you consider your Windows 11 setup complete, run through this final checklist:

  1. Windows Update shows “You’re up to date.”

  2. Windows Security (built-in Defender) shows a green tick on all four protection areas.

  3. BitLocker or Device Encryption is active and recovery key is saved.

  4. Windows Hello is enrolled and working.

  5. At least one backup location (cloud or local) is configured and has run at least once.

  6. All browser extensions apart from an ad-blocker are reviewed and necessary ones only are active.

  7. Startup apps list shows only essentials.

If every item above is ticked, your machine is in better shape than the vast majority of Windows laptops in daily use — and you’ve done it in a single session.

FAQ

Do I need a Microsoft Account to set up a Windows 11 laptop in 2026?

Windows 11 Home now requires a Microsoft Account during the standard OOBE setup flow, and Microsoft has removed most of the easy bypass routes in recent 2025–2026 Insider builds. A Microsoft Account is genuinely useful — it enables device encryption, recovery options, and settings sync. If you strongly prefer a local account, the workaround involves entering a command at the network screen during setup, though this may stop working in future updates.

What’s the difference between Windows 11 Home and Pro for a new setup?

For personal use and most freelance work, Windows 11 Home covers everything you need. Windows 11 Pro adds BitLocker full-disk encryption management, Remote Desktop host capability, Hyper-V for running virtual machines, and Group Policy — features that matter mainly in business or IT contexts. The price difference is modest; check the Windows 11 Pro vs Home comparison guide to decide which edition fits your needs.

How long does a full Windows laptop setup take in 2026?

Allow 45–90 minutes for the complete process — including updates, which require at least one reboot and sometimes two. The OOBE itself takes around 10 minutes. Software installation time varies depending on what you need, but using Winget to batch-install common tools cuts that significantly. Bloatware removal and security configuration together add another 15–20 minutes.

Is Windows Defender enough, or do I need third-party antivirus?

Microsoft Defender Antivirus, which ships built into Windows 11, consistently scores in the top tier of independent antivirus tests (AV-TEST and AV-Comparatives both give it high marks). For the vast majority of home users in 2026, Defender combined with a good ad-blocker, regular updates, and sensible browsing habits provides strong protection without the overhead of a paid suite. Third-party antivirus makes more sense in regulated business environments with specific compliance requirements.

Should I create a recovery drive as part of my new Windows setup?

Yes, and it’s worth doing it on day one before any problems arise. Insert a USB drive of at least 16 GB, search for “Create a recovery drive” in the Start menu, and follow the prompts. This lets you boot into repair tools, reset Windows, or reinstall the OS if your machine stops booting — without needing a separate installer download. Keep the drive somewhere safe and label it clearly.

A glowing padlock with a crack running through it sits in front of a dark blue circuit-board background, with a Windows 11 logo reflected in the metallic surface, symbolising a BitLocker bypass exploit security flaw discovered in June 2026
June 21, 2026

BitLocker Bypass Exploit: What Windows 11 Users Must Do Now

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A working BitLocker bypass exploit has been publicly released, and it is already sending shockwaves through the security community. Tracked as CVE-2026-45585 and nicknamed YellowKey, this Windows 11 encryption flaw lets an attacker with brief physical access read your supposedly encrypted drive — no password, no PIN, no recovery key required. If you use BitLocker to protect sensitive data on a Windows 11 device, you need to understand exactly what has happened and what you can do about it right now.

What Is the YellowKey BitLocker Vulnerability?

Step-by-step diagram of the BitLocker bypass exploit attack chain using USB

YellowKey is an unpatched BitLocker zero-day that exploits a weakness inside the Windows Recovery Environment (WinRE). The attacker boots the target machine from a specially crafted USB drive, which loads a custom FsTx folder structure that manipulates WinRE’s startup sequence. Because Windows Recovery Environment runs before the main OS — and therefore before BitLocker’s full authentication layer is enforced — the exploit can extract volume data without ever prompting for a decryption credential.

The vulnerability is classified under CWE-77 (Command Injection) and carries a CVSS score of 6.8. It affects Windows 11 (all currently supported versions) as well as Windows Server 2022 and 2025. The researcher who discovered it disclosed it publicly after becoming frustrated with slow vendor response — meaning a working proof-of-concept tool has been available on GitHub for anyone to download and use. That public availability is what makes this a critical incident rather than a theoretical risk.

How the BitLocker Bypass Exploit Actually Works

Understanding the attack chain helps you appreciate why the standard advice — “just keep Windows updated” — is not enough this time, because no patch yet exists.

  • Step 1 — Physical access: The attacker needs the device in their hands for only a few minutes. Stolen laptop, unattended workstation, or a device seized at a border — all are realistic attack scenarios.
  • Step 2 — Boot from USB: The malicious USB drive is inserted and the machine is restarted, booting directly into the crafted WinRE environment. Most consumer laptops allow USB boot by default.
  • Step 3 — FsTx folder injection: The custom FsTx folder tricks WinRE into treating the USB environment as a trusted recovery context, bypassing the prompt for a BitLocker PIN or recovery key.
  • Step 4 — Drive access: The encrypted volume is mounted and its contents become readable. The attacker can copy files, exfiltrate credentials, or plant malware — all while BitLocker appears to be doing its job.

The entire process can take under ten minutes, which makes it practical in the real world. No special hardware is needed beyond an off-the-shelf USB stick.

Why This Windows 11 Encryption Flaw Is So Serious

Risk gauge highlighting Windows 11 encryption flaw severity for affected users

BitLocker has been the flagship full-disk encryption tool built into Windows since Vista, and millions of professionals, businesses, and individuals rely on it as their primary defence against data theft when hardware is lost or stolen. A confirmed BitLocker zero-day of this nature undermines that entire trust model.

According to the official CVE-2026-45585 record, Microsoft has confirmed the vulnerability and issued interim mitigation guidance while a permanent security update is developed. The CVE advisory explicitly states: “We are issuing this CVE to provide mitigation guidance that can be implemented to protect against this vulnerability until the security update is available.” In other words, there is no patch yet — only a workaround script.

The breach is particularly damaging for organisations operating under GDPR, HIPAA, or similar data-protection frameworks. Encrypted storage is a recognised technical safeguard; if that safeguard is neutralised by a publicly known exploit, regulators may treat any resulting data loss as a failure of due diligence.

Who Is at Risk From This BitLocker Vulnerability?

You are potentially exposed if any of the following apply:

  • You run Windows 11 Home, Pro, or Enterprise with BitLocker (or Device Encryption) enabled.
  • You run Windows Server 2022 or 2025 with BitLocker volume protection.
  • Your device’s BIOS/UEFI firmware allows booting from USB without a password — which is the factory default on most consumer laptops.
  • You have not yet applied Microsoft’s interim mitigation script.
  • Your BitLocker configuration relies solely on TPM without a PIN (the most common default setup).

Devices running Windows 10 appear to be unaffected by this specific exploit chain, though they carry their own separate security concerns. Windows 11 users are the priority audience for this guidance.

How to Protect Yourself From the BitLocker Bypass Exploit

Windows 11 laptop screen showing BitLocker bypass exploit protection steps

There are several concrete steps you can take today, before Microsoft ships a full patch. None of them require waiting.

Apply Microsoft’s Official Mitigation Script

Microsoft has published a PowerShell mitigation script that modifies WinRE’s trusted boot path to prevent the FsTx injection technique from working. Download it from your Windows Update advisory dashboard or from Microsoft’s Security Response Center. Run it with administrator privileges on every affected device. This is the single most important step.

Enable a BitLocker Pre-Boot PIN

By default, most Windows 11 devices use TPM-only BitLocker protection, which means the drive auto-unlocks at boot without a PIN. Switching to TPM + PIN mode adds an authentication step that runs before WinRE loads, significantly raising the bar for a physical attacker. To enable it:

  1. Open Group Policy Editor (gpedit.msc) — available on Windows 11 Pro and above.
  2. Navigate to Computer Configuration → Administrative Templates → Windows Components → BitLocker Drive Encryption → Operating System Drives.
  3. Enable “Require additional authentication at startup” and set the PIN option to “Require startup PIN with TPM”.
  4. Run manage-bde -protectors -add C: -TPMAndPIN in an elevated Command Prompt and follow the prompts.

Disable USB Boot in BIOS/UEFI

If an attacker cannot boot from a USB drive, the exploit cannot run. Enter your device’s BIOS/UEFI firmware settings (typically by pressing F2, F10, Del, or Esc at startup) and either disable USB boot entirely or set a BIOS administrator password that is required before the boot order can be changed. This is a strong compensating control while the patch is pending.

Enable Secure Boot and Keep It Enabled

Secure Boot verifies the integrity of each component in the boot chain. While YellowKey has been demonstrated even on machines with Secure Boot active, combined with the PIN and BIOS controls above it creates a layered defence that significantly complicates the attack. Windows 11 already requires Secure Boot by default — confirm it has not been disabled on your device via System Information → System Summary → Secure Boot State.

Audit Physical Access Controls

Because this BitLocker bypass exploit requires physical access, hardening the physical environment matters. Lock unattended devices with a cable lock, enforce screen-lock policies, and ensure that company devices are never left in vehicles overnight. For travelling workers, whole-device encryption combined with the pre-boot PIN and disabled USB boot provides the strongest protection available until a patch lands.

What Microsoft Has Said — and What Still Needs to Happen

Microsoft has acknowledged CVE-2026-45585 and confirmed it is working on a permanent fix. The interim mitigation script, updated in late May 2026, replaces earlier manual steps with an automated tool that is easier to deploy at scale via Intune or Group Policy for enterprise environments. Individual users should apply it manually. Microsoft’s Security Response Center is tracking the issue and has indicated that a formal security update will arrive in a future Patch Tuesday release — though no date has been confirmed at time of writing.

The disclosure method — a disgruntled researcher dropping a working exploit on GitHub — is a reminder of why the security community’s relationship with responsible disclosure matters. Once a proof-of-concept is public, defenders have a narrowing window before opportunistic attackers begin using it routinely. Acting now, not when the patch arrives, is the right posture.

Does This Mean BitLocker Is Broken for Good?

No. The BitLocker vulnerability exposed by YellowKey is real and serious, but it is exploitable only with physical access. An attacker cannot run this exploit remotely over a network. BitLocker remains highly effective against the most common threat — bulk data theft from lost or stolen hardware — provided you add the pre-boot PIN and disable USB boot. Those two changes alone close the attack vector that YellowKey depends on.

Full-disk encryption still matters enormously. Without it, a thief who steals your laptop has instant access to every file on the drive; with BitLocker + PIN active, the same thief faces an effectively impenetrable barrier until Microsoft’s patch closes the WinRE gap entirely.

Keep Your Windows 11 Licence Current and Up to Date

Security patches are delivered through Windows Update, and a genuine, activated Windows 11 licence is what keeps that channel open. If your copy of Windows 11 is unactivated or running on an unsupported licence, you may not receive critical security updates — including whatever patch Microsoft eventually releases for CVE-2026-45585.

At Buy Now Key, you can pick up a legitimate Windows 11 Pro licence starting from €17.90 — a small investment compared to the cost of a data breach. If you need Windows 11 for home use, the Windows 11 Home licence is available from €15.60 and ensures you stay on Microsoft’s supported update track. Staying licensed means staying patched — and right now, patching quickly is everything.

For a broader overview of how the May 2026 update cycle addressed other vulnerabilities, see our earlier coverage of the Windows 11 KB5089549 update, which patched 120 vulnerabilities and included a related BitLocker recovery fix.

FAQ

Does the BitLocker bypass exploit work remotely?

No. CVE-2026-45585 (YellowKey) requires physical access to the target device. An attacker must be able to insert a USB drive and restart the machine. There is no known remote exploitation vector for this specific vulnerability, which means devices in secured, locked offices face a considerably lower risk than laptops carried by travelling workers.

Does Windows 11 Home support BitLocker with a PIN?

Windows 11 Home includes Device Encryption (a simplified form of BitLocker) but does not include the full Group Policy controls needed to enforce a pre-boot PIN. The TPM + PIN configuration described in this article requires Windows 11 Pro or higher. Upgrading to Pro is the most straightforward way to gain full BitLocker management on a Home device.

Is Windows 10 affected by this BitLocker vulnerability?

Based on current researcher and vendor reporting, the YellowKey exploit specifically targets the WinRE implementation found in Windows 11 and Windows Server 2022/2025. Windows 10 does not appear to be affected by this particular attack chain, though it carries other end-of-support security risks as it approaches its October 2025 end-of-life date.

Will applying the mitigation script break anything on my PC?

Microsoft’s official mitigation script is designed to modify WinRE’s trusted boot configuration without affecting normal Windows operation. Most users will notice no difference in day-to-day use. However, it is good practice to ensure you have a current BitLocker recovery key backed up to your Microsoft account or printed and stored securely before running any boot-level changes.

How will I know when the permanent patch is released?

Microsoft will deliver the fix through Windows Update as part of a future Patch Tuesday release. Enable automatic updates in Settings → Windows Update to receive it as soon as it becomes available. You can also monitor the Microsoft Security Response Center advisory for CVE-2026-45585 for the latest status.

Should I stop using BitLocker until this is fixed?

Absolutely not. Disabling BitLocker entirely would leave your data far more exposed than leaving it enabled with the interim mitigations applied. A device without any encryption is trivially readable by anyone who removes the drive. The correct response is to keep BitLocker active, enable the pre-boot PIN, apply the mitigation script, and disable USB boot in firmware.