CVE-2026-73266

Summary

A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.

Affected Software

VendorProductVersion RangeStatus
Red Hatmulticluster engine for Kubernetes 2.11787196014 < *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-441: Unintended Proxy or Intermediary ('Confused Deputy')

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