CVE-2026-27913: Windows BitLocker Security Feature Bypass Vulnerability

Overview

Severity

High (CVSS 7.7)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

Category

Security Feature Bypass

Exploit Status

Not Exploited

Exploitation Likelihood

More Likely

Patch Tuesday

2026-Apr

Released

2026-04-14

Description

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

FAQ

What kind of security feature could be bypassed by successfully exploiting this vulnerability? An attacker who successfully exploited this vulnerability could bypass Secure Boot.

Affected Products (11)

Windows

• Windows Server 2019
• Windows Server 2022, 23H2 Edition (Server Core installation)
• Windows Server 2016
• Windows Server 2016 (Server Core installation)
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows Server 2022 (Server Core installation)

ESU

• Windows Server 2012 (Server Core installation)
• Windows Server 2012
• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)

Security Updates (6)

• 5082123
• 5082060
• 5082198
• 5082142
• 5082127
• 5082126

Acknowledgments

<a href="https://x.com/alon_leviev">Alon Leviev</a> with Microsoft (STORM)

Revision History

• 2026-04-14: Information published.