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Unrated severityNVD Advisory· Published Jan 13, 2026· Updated Apr 1, 2026

Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability

CVE-2026-20854

Description

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

Affected products

4

Microsoft/Windows 11 24h2cpe-rescue
Range: 10.0.26100.0
Microsoft/Windows 11 25h2cpe-rescue
Range: 10.0.26200.0
Microsoft/Windows Server 2025cpe-rescue
Range: 10.0.26100.0
Microsoft/Windows Server 2025 (Server Core installation)v5
Range: 10.0.26100.0

Patches

Vulnerability mechanics

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20854mitrevendor-advisorypatch

News mentions

0

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CVE-2026-20854 · VYPR