CVE-2026-20833: Microsoft Windows Server 2008

Medium severity, CVSS 5.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Use of a broken or risky cryptographic algorithm in Windows Kerberos allows an authorized attacker to disclose information locally.

Affected products

• Microsoft Windows Server 2008: affected versions not specified; version r2 only
• Microsoft Windows Server 2012: affected versions not specified; version r2 only
• Microsoft Windows Server 2016: before 10.0.14393.8783 (fixed in 10.0.14393.8783)
• Microsoft Windows Server 2019: before 10.0.17763.8276 (fixed in 10.0.17763.8276)
• Microsoft Windows Server 2022: before 10.0.20348.4648 (fixed in 10.0.20348.4648)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.2092 (fixed in 10.0.25398.2092)
• Microsoft Windows Server 2025: before 10.0.26100.32230 (fixed in 10.0.26100.32230)

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