CVE-2026-21251 Cluster Client Failover (CCF) Elevation of Privilege Vulnerability

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CVE-2026-21251

CVE-2026-21251 describes a use-after-free in the Windows Cluster Client Failover, enabling a locally authenticated attacker to achieve privilege elevation. The CVSS 3.1 base score is 7.8 (HIGH) with local attack vector, low complexity, and low privileges required; confidentiality, integrity, and ...