CVE-2026-20854

HighCVSS 7.5/10Last modified Jul 30, 2026

Description

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

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

Vendor	Product	Versions
Microsoft	Windows 11 Version 24H2	>= 10.0.26100.0, < 10.0.26100.7623
Microsoft	Windows 11 Version 25H2	>= 10.0.26200.0, < 10.0.26200.7623
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.32230
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.32230

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20854Vendor Advisory

Timeline

Published: Jan 13, 2026
Last modified: Jul 30, 2026
NVD status: Analyzed

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