CVE-2026-73267

Summary

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 Software

VendorProductVersion RangeStatus
Red Hatmulticluster engine for Kubernetes 2.101787196014 < *unaffected
Red Hatmulticluster engine for Kubernetes 2.111787239442 < *unaffected
Red Hatmulticluster engine for Kubernetes 2.171786577950 < *unaffected
Red Hatmulticluster engine for Kubernetes 2.61787259112 < *unaffected
Red Hatmulticluster engine for Kubernetes 2.81787259059 < *unaffected
Red Hatmulticluster engine for Kubernetes 2.91787195995 < *unaffected

Weaknesses

  • CWE-602: Client-Side Enforcement of Server-Side Security

Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References