Microsoft disclosed a new Windows BitLocker security feature bypass vulnerability on June 9, 2026, tracked as CVE-2026-50507, affecting a wide range of Windows 10, Windows 11, and Windows Server editions.
The flaw enables an unauthorized attacker with physical access to circumvent BitLocker Device Encryption and gain access to data on a protected storage device with no privileges or user interaction required.
CVE-2026-50507 is rooted in a protection mechanism failure within Windows BitLocker, classified under CWE-306: Missing Authentication for Critical Function.
Windows BitLocker 0-Day Vulnerability
This weakness occurs when a system feature performing a sensitive operation, in this case, decrypting a protected storage volume, fails to verify the identity of the requester before proceeding.
Microsoft has assessed the vulnerability with a CVSS 3.1 base score of 6.8 (temporal score: 6.1), reflecting a physical attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability.
The vulnerability was publicly disclosed prior to the patch release and carries a Proof-of-Concept (PoC) exploit maturity rating, meaning functional exploit code is already available in the wild.
Microsoft’s exploitability assessment categorizes it as “Exploitation More Likely,” despite no confirmed in-the-wild exploitation at the time of publication.
The attack vector is classified as Physical (AV:P) with no privileges required (PR:N) and no user interaction (UI:N), meaning a threat actor with brief physical access to a target machine, such as in an unattended laptop scenario, can potentially extract data from an encrypted drive without needing to know any credentials.
The underlying issue is a failure in the protection mechanism surrounding BitLocker rather than in the cryptographic algorithms themselves.
Systems relying on TPM-only BitLocker configurations are particularly exposed, as the TPM automatically releases the Volume Master Key (VMK) during boot without requiring additional authentication factors.
Affected Systems
The vulnerability spans an extensive range of Windows platforms, including:
- Windows 10 (Versions 1607, 1809, 21H2, 22H2 — 32-bit, x64, ARM64)
- Windows 11 (Versions 23H2, 24H2, 25H2, 26H1 — x64 and ARM64)
- Windows Server 2012 R2, 2016, 2019, 2022, 2025 (including Server Core installations)
Security updates were released on June 9, 2026, as part of Microsoft’s Patch Tuesday cycle, with KB articles including KB5094041, KB5094122, KB5094123, KB5094127, KB5094128, KB5094126, and KB5095051 covering respective platforms.
Microsoft has issued an official fix and strongly urges administrators to apply the June 2026 security updates immediately.
As an additional hardening measure, organizations should migrate from TPM-only BitLocker configurations to TPM + PIN authentication, which requires a user-supplied PIN at startup before the TPM releases encryption keys.
For environments where immediate patching is not feasible, manually modifying the Windows Recovery Environment (WinRE) image, specifically removing the autofstx.exe entry from the BootExecute registry value under Session Manager.
Administrators should also enforce startup PIN policies via Group Policy or Microsoft Intune across managed endpoints.
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