What’s Vulnerable › Vulnerabilities
CVE-2026-20854: Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-01-13 · updated 2026-07-30
- Weakness: CWE-416
Description
Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.
Affected products
- Microsoft Windows 11: before 10.0.26100.7623 — fixed in 10.0.26100.7623
- Microsoft Windows 11 25H2: before 10.0.26200.7623 — fixed in 10.0.26200.7623
- Microsoft Windows Server 2025: before 10.0.26100.32230 — fixed in 10.0.26100.32230
- Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.7623 — fixed in 10.0.26100.7623
- Microsoft Windows 11 25H2: from 10.0.26200.0 before 10.0.26200.7623 — fixed in 10.0.26200.7623
- Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.32230 — fixed in 10.0.26100.32230
How to fix
Upgrade to a fixed version: Microsoft Windows 11 10.0.26100.7623; Microsoft Windows 11 25H2 10.0.26200.7623; Microsoft Windows Server 2025 10.0.26100.32230; Microsoft Windows 11 10.0.26100.7623; Microsoft Windows 11 25H2 10.0.26200.7623; Microsoft Windows Server 2025 10.0.26100.32230. Check the vendor advisory for mitigations.
References
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