CVE-2026-20830: Microsoft Windows Server 2025

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

Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft Windows Server 2025: before 10.0.26100.7623 (fixed in 10.0.26100.7623)

Published 2026-01-13. Last modified 2026-06-17.