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CVE Number Vulnerability Product Severity Date
CVE-2026-21265 Secure Boot Certificate Expiration Security Feature Bypass Vulnerability Windows 11, Windows 10, Windows Server Important 29-01-2026

Technical Information

An authenticated attacker with high privileges could bypass the Secure Boot’s security feature by manipulating non-updateable components under specific system conditions.

Patch release date: Jan 13, 2026
Further information on this vulnerability is available at : CVE-2026-21265

Affected Software

Windows 10 Version 1809 for 32-bit Systems,
Windows 10 Version 1809 for x64-based Systems,
Windows Server 2019,
Windows Server 2019 (Server Core installation),
Windows Server 2022,
Windows Server 2022 (Server Core installation),
Windows 10 Version 21H2 for 32-bit Systems,
Windows 10 Version 21H2 for ARM64-based Systems,
Windows 10 Version 21H2 for x64-based Systems,
Windows 10 Version 22H2 for x64-based Systems,
Windows 10 Version 22H2 for ARM64-based Systems,
Windows 10 Version 22H2 for 32-bit Systems,
Windows Server 2025 (Server Core installation),
Windows 11 Version 25H2 for ARM64-based Systems,
Windows 11 Version 25H2 for x64-based Systems,
Windows 11 Version 23H2 for ARM64-based Systems,
Windows 11 Version 23H2 for x64-based Systems,
Windows Server 2022, 23H2 Edition (Server Core installation),
Windows 11 Version 24H2 for ARM64-based Systems,
Windows 11 Version 24H2 for x64-based Systems,
Windows Server 2025,
Windows 10 Version 1607 for 32-bit Systems,
Windows 10 Version 1607 for x64-based Systems,
Windows Server 2016,
Windows Server 2016 (Server Core installation),
Windows Server 2012,
Windows Server 2012 (Server Core installation),
Windows Server 2012 R2,
Windows Server 2012 R2 (Server Core installation)""Windows 10 Version 1809 for 32-bit Systems,
Windows 10 Version 1809 for x64-based Systems,
Windows Server 2019,
Windows Server 2019 (Server Core installation),
Windows Server 2022,
Windows Server 2022 (Server Core installation),
Windows 10 Version 21H2 for 32-bit Systems,
Windows 10 Version 21H2 for ARM64-based Systems,
Windows 10 Version 21H2 for x64-based Systems,
Windows 10 Version 22H2 for x64-based Systems,
Windows 10 Version 22H2 for ARM64-based Systems,
Windows 10 Version 22H2 for 32-bit Systems,
Windows Server 2025 (Server Core installation),
Windows 11 Version 25H2 for ARM64-based Systems,
Windows 11 Version 25H2 for x64-based Systems,
Windows 11 Version 23H2 for ARM64-based Systems,
Windows 11 Version 23H2 for x64-based Systems,
Windows Server 2022, 23H2 Edition (Server Core installation),
Windows 11 Version 24H2 for ARM64-based Systems,
Windows 11 Version 24H2 for x64-based Systems,
Windows Server 2025,
Windows 10 Version 1607 for 32-bit Systems,
Windows 10 Version 1607 for x64-based Systems,
Windows Server 2016,
Windows Server 2016 (Server Core installation),
Windows Server 2012,
Windows Server 2012 (Server Core installation),
Windows Server 2012 R2,
Windows Server 2012 R2 (Server Core installation)