7.8
High
CVE-2026-21251 Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally
Description
Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Windows Server 2019 10.0 | 10.0.17763.0 → < 10.0.17763.8389 | 10.0.17763.8389 |
| Windows Server 2019 (Server Core installation) 10.0 | 10.0.17763.0 → < 10.0.17763.8389 | 10.0.17763.8389 |
| Windows Server 2022 10.0 | 10.0.20348.0 → < 10.0.20348.4773 | 10.0.20348.4773 |
| Windows Server 2025 (Server Core installation) 10.0 | 10.0.26100.0 → < 10.0.26100.32370 | 10.0.26100.32370 |
| Windows Server 2022, 23H2 Edition (Server Core installation) 10.0 | 10.0.25398.0 → < 10.0.25398.2149 | 10.0.25398.2149 |
| Windows Server 2025 10.0 | 10.0.26100.0 → < 10.0.26100.32370 | 10.0.26100.32370 |
| Windows Server 2016 10.0 | 10.0.14393.0 → < 10.0.14393.8868 | 10.0.14393.8868 |
| Windows Server 2016 (Server Core installation) 10.0 | 10.0.14393.0 → < 10.0.14393.8868 | 10.0.14393.8868 |
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