HIGH 7.5 Microsoft
CVE-2026-20854
Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability
Microsoft Security Update 2026-Jan: Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability
Affected Products
- 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 24H2 for ARM64-based Systems
- Windows 11 Version 24H2 for x64-based Systems
- Windows Server 2025
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20854
- https://nvd.nist.gov/vuln/detail/CVE-2026-20854
This high severity vulnerability with a CVSS score of 7.5 was published on 2026-01-13 via Microsoft. Affected: Windows Server 2025 (Server Core installation), Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems and 3 more.
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