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CVE-2026-21251

Cluster Client Failover (CCF) Elevation of Privilege Vulnerability PUBLISHED

Description (CNA)

No English CNA description was supplied.

Affected (CNA)

Vendor / product	Versions
Microsoft / Windows Server 2016	affected 10.0.14393.0 before 10.0.14393.8868
Microsoft / Windows Server 2016 (Server Core installation)	affected 10.0.14393.0 before 10.0.14393.8868
Microsoft / Windows Server 2019	affected 10.0.17763.0 before 10.0.17763.8389
Microsoft / Windows Server 2019 (Server Core installation)	affected 10.0.17763.0 before 10.0.17763.8389
Microsoft / Windows Server 2022	affected 10.0.20348.0 before 10.0.20348.4773
Microsoft / Windows Server 2022, 23H2 Edition (Server Core installation)	affected 10.0.25398.0 before 10.0.25398.2149
Microsoft / Windows Server 2025	affected 10.0.26100.0 before 10.0.26100.32370
Microsoft / Windows Server 2025 (Server Core installation)	affected 10.0.26100.0 before 10.0.26100.32370

CWE

CWE-416

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21251

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.