CVE-2026-26165: Microsoft Windows 11 23h2

High severity, CVSS 7.0. EPSS: 0.3% chance of exploitation in the next 30 days.

Use after free in Windows Shell allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft Windows 11 23h2: before 10.0.22631.6936 (fixed in 10.0.22631.6936)
• Microsoft Windows 11 24h2: before 10.0.26100.8246 (fixed in 10.0.26100.8246)
• Microsoft Windows 11 25h2: before 10.0.26200.8246 (fixed in 10.0.26200.8246)
• Microsoft Windows 11 26h1: before 10.0.28000.1836 (fixed in 10.0.28000.1836)
• 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)
• Microsoft Windows Server 2025: before 10.0.26100.32690 (fixed in 10.0.26100.32690)

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