CVE-2026-50661 – Windows BitLocker Security Feature Bypass Vulnerability

A protection mechanism failure in Microsoft Windows BitLocker allows an unauthorized attacker with physical access to a device to bypass the BitLocker Device Encryption security feature. If successfully exploited, the vulnerability could allow access to data stored on encrypted system drives, reducing the protection that BitLocker is designed to provide. Microsoft has classified this issue as requiring customer action and has released security updates for affected Windows client and server platforms.

CVSS Score: 6.1

SEVERITY: Important

THREAT:
This vulnerability targets Windows BitLocker, Microsoft’s full-disk encryption feature. An attacker who gains physical possession of a vulnerable system may be able to bypass BitLocker protection and access encrypted data. Although the attack requires physical access, the potential exposure of sensitive corporate or personal information makes this a significant security concern, particularly for lost, stolen, or unattended devices.

EXPLOITS:
At the time of publication, the vulnerability has been publicly disclosed but has not been reported as exploited. Microsoft rates exploitation as less likely, and there is no confirmed public proof-of-concept or zero-day exploitation documented in the provided information.

TECHNICAL SUMMARY:
The vulnerability is caused by a protection mechanism failure (CWE-693) within Windows BitLocker. Instead of compromising encryption algorithms directly, the flaw allows an attacker with physical access to bypass the BitLocker Device Encryption feature protecting the system storage device. Successful exploitation can result in unauthorized access to encrypted information stored on the affected system. The vulnerability does not impact system availability but has a high impact on both confidentiality and integrity of protected data.

EXPLOITABILITY:
Affected products include multiple supported versions of Windows 10, Windows 11, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025, including applicable Server Core installations listed in Microsoft’s advisory. Exploitation requires physical access to the target device and does not require user interaction or privileges.

BUSINESS IMPACT:
Organizations relying on BitLocker to protect sensitive information on laptops, desktops, and servers face an increased risk if devices are lost, stolen, or accessed by unauthorized individuals. A successful attack could expose confidential business data, regulated information, intellectual property, or credentials that organizations expect to remain protected by disk encryption. Systems deployed in remote locations or shared environments may be particularly vulnerable.

WORKAROUND:
No mitigations or workarounds are available. Microsoft has published security updates to address the vulnerability, and applying the appropriate update is the recommended remediation.