CVE-2026-73267

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

Published Aug 21, 2026 CVSS 3.1 · 7.7 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

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.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Clusterclaims-controller: clusterclaims-controller: managedcluster deletion keyed solely on clusterclaim.spec.namespace with no ownership check Clusterclaims-controller: managedcluster deletion keyed solely on clusterclaim.spec.namespace with no local ownership check
Type Values Removed Values Added
CPEs cpe:/a:redhat:multicluster_engine:2.10::el9
cpe:/a:redhat:multicluster_engine:2.6::el9
cpe:/a:redhat:multicluster_engine:2.8::el9
cpe:/a:redhat:multicluster_engine:2.9::el9
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:multicluster_engine:2.17::el9
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:multicluster_engine cpe:/a:redhat:multicluster_engine:2.11::el9
References
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Redhat multicluster Engine For Kubernetes
Vendors & Products Redhat multicluster Engine For Kubernetes
Type Values Removed Values Added
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.
Title Clusterclaims-controller: clusterclaims-controller: managedcluster deletion keyed solely on clusterclaim.spec.namespace with no ownership check
First Time appeared Redhat
Redhat multicluster Engine
Weaknesses CWE-602
CPEs cpe:/a:redhat:multicluster_engine
Vendors & Products Redhat
Redhat multicluster Engine
References
Metrics cvssV3_1

{'score': 7.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Sep 29, 2026, 7:41 PM
Reserved
Aug 11, 2026, 5:22 PM
Status
Awaiting Analysis
Published
Aug 21, 2026, 3:16 AM
Modified
Oct 26, 2026, 10:10 AM