CVE-2026-78444: Microsoft Failover Cluster Remote Code Execution Vulnerability
Microsoft Failover Cluster Remote Code Execution Vulnerability
Other sources
Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9245Patch KB5122876 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33438Patch KB5122871
Event History
Frequently Asked Questions
Which systems are identified as affected?
The affected software list includes Microsoft Windows 10, Windows Server 2019, Windows Server 2022, and Windows Server 2025.
Can an unauthenticated attacker exploit this remotely?
Yes. The vector is network-based and requires no privileges or user interaction, so an unauthorized attacker can attempt exploitation over the network. The listed attack complexity is high.
What impact could successful exploitation have?
Successful exploitation can allow remote code execution. The advisory’s metrics indicate high impact to confidentiality, integrity, and availability.