CVE-2026-73010: Microsoft Windows 10 1809

Critical severity, CVSS 9.8. EPSS: 1% chance of exploitation in the next 30 days.

Use after free in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.

Affected products

• Microsoft Windows 10 1809: before 10.0.17763.9245 (fixed in 10.0.17763.9245)
• Microsoft Windows Server 2019: before 10.0.17763.9245 (fixed in 10.0.17763.9245)
• Microsoft Windows Server 2022: before 10.0.20348.5622 (fixed in 10.0.20348.5622)
• Microsoft Windows Server 2025: before 10.0.26100.33438 (fixed in 10.0.26100.33438)

Published 2026-09-08. Last modified 2026-09-17.