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Windows Failover Cluster

CVE-2026-73010 — Microsoft Failover Cluster Remote Code Execution Vulnerability

Critical CVSS 9.8 2026-09 archive

Executive Summary

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

Overview

9.8
CVSS CRITICAL
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Weakness CWE-416: Use After Free
Released Sep 8 2026
Last Updated Sep 8 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known

CVSS Vector

ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 8.5

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

8 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 1809 for 32-bit Systems 5122876 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for x64-based Systems 5122876 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 5122876 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 (Server Core installation) 5122876 (Security Update) Critical Remote Code Execution Yes
Windows Server 2022 5122882 (Security Update) Critical Remote Code Execution Yes
Windows Server 2022 (Server Core installation) 5122882 (Security Update) Critical Remote Code Execution Yes
Windows Server 2025 5122871 (Security Update) Critical Remote Code Execution Yes
Windows Server 2025 (Server Core installation) 5122871 (Security Update) Critical Remote Code Execution Yes

Patches

3 patches
Article Type Restart
5122876 Security Update Yes
5122882 Security Update Yes
5122871 Security Update Yes

Exploits & PoC

Detection Rules

Acknowledgments

41ae55e9310ff27fa6f26af4727e5590

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