CVE-2026-50661: CVE-2026-50661: Windows BitLocker Security Feature Bypass

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CVE-2026-50661: Windows BitLocker Security Feature Bypass

Vulnerability ID: CVE-2026-50661
CVSS Score: 6.1
Published: 2026-07-14

CVE-2026-50661 is a security feature bypass vulnerability in Microsoft Windows BitLocker full-disk encryption. A physical attacker can exploit this flaw to bypass encryption controls, permitting unauthorized access to sensitive local storage and the modification of offline system configurations.

TL;DR

A physical security feature bypass in Windows BitLocker allows physical attackers to decrypt system drives and manipulate configurations by exploiting weak pre-boot verification and automatic TPM key release mechanisms.

Technical Details

CWE ID: CWE-693 (Protection Mechanism Failure)
Attack Vector: Physical (AV:P)
CVSS v3.1 Score: 6.1 (Medium)
EPSS Score: Not Available
Exploit Status: None (No Public PoC)
CISA KEV Status: Not Listed
Primary Impact: Loss of Confidentiality & Integrity

Affected Systems

Windows 10
Windows 11
Windows Server 2016
Windows Server 2019
Windows Server 2022
Windows Server 2025
Windows 10 Version 22H2: < 10.0.19045.7548 (Fixed in: 10.0.19045.7548)
Windows 11 Version 24H2: < 10.0.26100.8875 (Fixed in: 10.0.26100.8875)
Windows Server 2025: < 10.0.26100.33158 (Fixed in: 10.0.26100.33158)

Mitigation Strategies

Enforce pre-boot PIN or Password authentication
Apply July 2026 cumulative security updates
Enable Kernel DMA Protection in BIOS/UEFI
Disable Windows Recovery Environment (WinRE) if appropriate

Remediation Steps:

Apply Microsoft security updates for your specific Windows OS build
Enable pre-boot PIN requirement via Group Policy or MDM
Run 'reagentc /disable' to block unauthenticated recovery console access
Verify Kernel DMA Protection is active in system settings

References

Read the full report for CVE-2026-50661 on our website for more details including interactive diagrams and full exploit analysis.

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