CyberICT

CVE-2026-20854

Microsoft · Published January 13, 2026

CVSS v3.1

HIGH
Patch availableGet patch

Description

Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability. Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.

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

CVSS Vector

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