CVE-2026-20920: Microsoft Windows 11 23h2

High severity, CVSS 7.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft Windows 11 23h2: before 10.0.22631.6491 (fixed in 10.0.22631.6491)
• Microsoft Windows Server 2022: before 10.0.20348.4648 (fixed in 10.0.20348.4648)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.2092 (fixed in 10.0.25398.2092)

Published 2026-01-13. Last modified 2026-07-30.