CVE-2026-26183: Microsoft Windows Server 2012

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

Improper access control in Windows RPC API allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft Windows Server 2012: affected versions not specified; version r2 only
• Microsoft Windows Server 2016: before 10.0.14393.9060 (fixed in 10.0.14393.9060)
• Microsoft Windows Server 2019: before 10.0.17763.8644 (fixed in 10.0.17763.8644)
• 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.