CVE-2026-73267

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.

Scoring

Severity

HIGH

CVSS base score

7.7

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

EPSS probability

0.46%

CWE

CWE-602

Published

2026-08-21

Last modified

2026-09-08

Affected products

• Red Hat multicluster engine for Kubernetes 2.9.0
• Red Hat multicluster engine for Kubernetes 2.11
• Red Hat multicluster engine for Kubernetes 2.17
• Red Hat multicluster engine for Kubernetes 2.10
• Red Hat multicluster engine for Kubernetes 2.6
• Red Hat multicluster engine for Kubernetes 2.8
• Red Hat multicluster engine for Kubernetes 2.9
• Red Hat multicluster engine for Kubernetes 2.1

Weakness type

• CWE-602

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