Remote Code Execution Vulnerability in Windows Local Security Authority Subsystem Service
CVE-2026-20854

7.5HIGH

Key Information:

Vendor

Microsoft
Status
Windows Server 2025 (server Core Installation)
Windows 11 Version 25h2
Windows 11 Version 24h2
Windows Server 2025
Vendor
CVE Published:
13 January 2026

What is CVE-2026-20854?

A vulnerability exists in the Windows Local Security Authority Subsystem Service (LSASS) due to a use-after-free condition that can allow an authorized attacker to execute arbitrary code remotely. This flaw can be exploited over a network, enabling potential unauthorized access to system functions and sensitive data. To mitigate this risk, users are advised to apply the latest security patches provided by Microsoft.

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Affected Version(s)

Windows 11 Version 24H2 ARM64-based Systems 10.0.26100.0 < 10.0.26100.7623

Windows 11 Version 25H2 10.0.26200.0 < 10.0.26200.7623

Windows Server 2025 (Server Core installation) x64-based Systems 10.0.26100.0 < 10.0.26100.32230

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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