high7.8
CVE-2026-21251
Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally.
Impact
Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows Server 2016 | before 10.0.14393.8868 |
| Microsoft | Windows Server 2019 | before 10.0.17763.8389 |
| Microsoft | Windows Server 2022 | before 10.0.20348.4711 |
| Microsoft | Windows Server 2022 23h2 | before 10.0.25398.2149 |
| Microsoft | Windows Server 2025 | before 10.0.26100.32313 |