CVE-2026-71338: Windows Failover Cluster Elevation of Privilege Vulnerability
Double free in Windows Failover Cluster allows an authorized attacker to elevate privileges locally.
Other sources
Windows Failover Cluster Elevation of Privilege Vulnerability
— 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 10.0.14393.9512Patch KB5123099 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
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Fixed in 10.0.26100.33438Patch KB5122871 - Upgrade
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Fixed in 10.0.17763.9245Patch KB5122876 - Upgrade
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Fixed in 6.3.9600.23397Patch KB5123066 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.26349Patch KB5123065
Event History
Frequently Asked Questions
Who is exposed to this vulnerability?
Systems running the listed Windows client or server versions are in scope if they use Windows Failover Cluster. Exploitation is local and requires an authorized attacker.
What level of access does an attacker need?
The attacker must already be authorized on the affected system and able to execute an attack locally. The available data does not indicate that remote exploitation or user interaction is required.
What is the potential impact after successful exploitation?
Successful exploitation can elevate the attacker's privileges locally. The supplied severity vector indicates potential high impact to confidentiality, integrity, and availability.