CVE-2026-27924: Microsoft Windows 10 21h2

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Use after free in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft Windows 10 21h2: before 10.0.19044.7184 (fixed in 10.0.19044.7184)
• Microsoft Windows 10 22h2: before 10.0.19045.7184 (fixed in 10.0.19045.7184)
• Microsoft Windows 11 23h2: before 10.0.22631.6936 (fixed in 10.0.22631.6936)
• Microsoft Windows Server 2022: before 10.0.20348.5020 (fixed in 10.0.20348.5020)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.2274 (fixed in 10.0.25398.2274)

Published 2026-04-14. Last modified 2026-06-17.