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Advisory severityHigh7.7Red Hat Linux

High [CVE-2026-73267] ManagedCluster deletion keyed solely on ClusterClaim.Spec.Namespace with no ownership check

This high-severity Red Hat Linux advisory covers CVE-2026-73267 affecting multicluster engine for Kubernetes 2.11, multicluster engine for Kubernetes 2.17, multicluster engine for Kubernetes 2.6.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-73267 Source published Source updated

VulniPulse record published Record updated

CVE-2026-73267
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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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.

This is an Important flaw in Multicluster Engine for Kubernetes. Red Hat severity: Important — CVSS 7.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H).

Weakness: CWE-602. Affected Red Hat products: multicluster engine for Kubernetes 2.1; multicluster engine for Kubernetes 2.11; multicluster engine for Kubernetes 2.17; multicluster engine for Kubernetes 2.6; multicluster engine for Kubernetes 2.8; multicluster engine for Kubernetes 2.9.

Red Hat fixing advisory: RHSA-2026:59557, RHSA-2026:59556, RHSA-2026:59593, RHSA-2026:59579, RHSA-2026:59558, RHSA-2026:59559.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Fixed versions
  • multicluster-engine/clusterclaims-controller-rhel9:1787196014
  • multicluster-engine/clusterclaims-controller-rhel9:1787239442
  • multicluster-engine/clusterclaims-controller-rhel9:1786577950
  • multicluster-engine/clusterclaims-controller-rhel9:1787259112
  • multicluster-engine/clusterclaims-controller-rhel9:1787259059
  • multicluster-engine/clusterclaims-controller-rhel9:1787195995
  • RHSA-2026:59557
  • RHSA-2026:59556
  • RHSA-2026:59593
  • RHSA-2026:59579
  • RHSA-2026:59558
  • RHSA-2026:59559

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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.

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

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