CVE-2026-73010

Microsoft Failover Cluster Remote Code Execution Vulnerability

CVE-2026-73010 is fixed in 8 products on 1 platform, first by KB5122876, released September 8, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

9.8

Critical

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0097

62nd percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 10 Version 1809 for 32-bit Systems	17763.9245	KB5122876	Sep 8, 2026
Windows 10 Version 1809 for x64-based Systems	17763.9245	KB5122876	Sep 8, 2026
Windows Server 2019	17763.9245	KB5122876	Sep 8, 2026
Windows Server 2019 (Server Core installation)	17763.9245	KB5122876	Sep 8, 2026
Windows Server 2022	20348.5622	KB5122882	Sep 8, 2026
Windows Server 2022 (Server Core installation)	20348.5622	KB5122882	Sep 8, 2026
Windows Server 2025	26100.33438	KB5122871	Sep 8, 2026
Windows Server 2025 (Server Core installation)	26100.33438	KB5122871	Sep 8, 2026

Details

Published
September 8, 2026
Weakness
Use After Free
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-73010

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