CVE-2025-59257: Microsoft Windows 11 24h2

Medium severity, CVSS 6.5. EPSS: 1.5% chance of exploitation in the next 30 days.

Improper validation of specified type of input in Windows Local Session Manager (LSM) allows an authorized attacker to deny service over a network.

Affected products

• Microsoft Windows 11 24h2: before 10.0.26100.6899 (fixed in 10.0.26100.6899)
• Microsoft Windows 11 25h2: before 10.0.26200.6899 (fixed in 10.0.26200.6899)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.1913 (fixed in 10.0.25398.1913)
• Microsoft Windows Server 2025: up to and including 10.0.26100.6899

Published 2025-10-14. Last modified 2026-06-17.