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7.7 High

CVE-2026-27913 Improper input validation in Windows BitLocker allows an unauthorized attacker to bypass a security feature locally

Description

Improper input validation in Windows BitLocker allows an unauthorized attacker to bypass a security feature locally.

Affected products and versions

Product	Affected versions	Fixed in
Windows Server 2012 6.2	6.2.9200.0 → < 6.2.9200.26026	6.2.9200.26026
Windows Server 2012 (Server Core installation) 6.2	6.2.9200.0 → < 6.2.9200.26026	6.2.9200.26026
Windows Server 2012 R2 6.3	6.3.9600.0 → < 6.3.9600.23132	6.3.9600.23132
Windows Server 2012 R2 (Server Core installation) 6.3	6.3.9600.0 → < 6.3.9600.23132	6.3.9600.23132
Windows Server 2016 10.0	10.0.14393.0 → < 10.0.14393.9060	10.0.14393.9060
Windows Server 2016 (Server Core installation) 10.0	10.0.14393.0 → < 10.0.14393.9060	10.0.14393.9060
Windows Server 2019 10.0	10.0.17763.0 → < 10.0.17763.8644	10.0.17763.8644
Windows Server 2019 (Server Core installation) 10.0	10.0.17763.0 → < 10.0.17763.8644	10.0.17763.8644
Windows Server 2022 10.0	10.0.20348.0 → < 10.0.20348.5020	10.0.20348.5020

Show the other branch

Product	Affected versions	Fixed in
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0	10.0.25398.0 → < 10.0.25398.2274	10.0.25398.2274

References

Windows BitLocker Security Feature Bypass Vulnerability msrc.microsoft.com

Timeline

Published April 14, 2026
Last modified October 15, 2026

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