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Vulnerability · Published Aug 21, 2026 · Assigned by redhat

CVE-2026-73267Clusterclaims-controller: managedcluster deletion keyed solely on clusterclaim.spec.namespace with no local ownership check

High 7.7

In plain English

A high-severity security flaw in multicluster engine for Kubernetes 2.10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.6%top 49.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 (as reported)

VendorProductVersions
Red Hat multicluster engine for Kubernetes 2.10 see references
Red Hat multicluster engine for Kubernetes 2.11 see references
Red Hat multicluster engine for Kubernetes 2.17 see references
Red Hat multicluster engine for Kubernetes 2.6 see references
Red Hat multicluster engine for Kubernetes 2.8 see references
Red Hat multicluster engine for Kubernetes 2.9 see references

Weakness: CWE-602 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

References