CVE-2026-58634: Microsoft Windows 11 26h1

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 11 26h1: before 10.0.28000.2525 (fixed in 10.0.28000.2525)

Published 2026-07-14. Last modified 2026-07-15.