CVE-2026-73267: Red Hat Multicluster Engine For Kubernetes 2.10

High severity, CVSS 7.7. EPSS: 0.6% chance of exploitation in the next 30 days.

A flaw was found in the clusterclaims-controller component of multicluster engine (MCE). A tenant with standard permissions to create and delete ClusterClaim resources can exploit this by manipulating the `spec.namespace` field. This allows the tenant to specify and delete any ManagedCluster, including the hub's local-cluster or other tenants' clusters, due to a missing ownership check. This vulnerability can lead to a denial of service by enabling unauthorized deletion of ManagedClusters.

Affected products

• Red Hat Multicluster Engine For Kubernetes 2.10: before 1787196014 (fixed in 1787196014)
• Red Hat Multicluster Engine For Kubernetes 2.11: before 1787239442 (fixed in 1787239442)
• Red Hat Multicluster Engine For Kubernetes 2.17: before 1786577950 (fixed in 1786577950)
• Red Hat Multicluster Engine For Kubernetes 2.6: before 1787259112 (fixed in 1787259112)
• Red Hat Multicluster Engine For Kubernetes 2.8: before 1787259059 (fixed in 1787259059)
• Red Hat Multicluster Engine For Kubernetes 2.9: before 1787195995 (fixed in 1787195995)

Published 2026-08-21. Last modified 2026-09-29.