High severity · published Aug 21, 2026
CVE-2026-73267
Clusterclaims-controller: managedcluster deletion keyed solely on clusterclaim.spec.namespace with no local ownership check
7.7
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
multicluster engine for Kubernetes 2.10 · Red Hat
All versions, or not specified · source: vendor
ME
multicluster engine for Kubernetes 2.11 · Red Hat
All versions, or not specified · source: vendor
ME
multicluster engine for Kubernetes 2.17 · Red Hat
All versions, or not specified · source: vendor
ME
multicluster engine for Kubernetes 2.6 · Red Hat
All versions, or not specified · source: vendor
ME
multicluster engine for Kubernetes 2.8 · Red Hat
All versions, or not specified · source: vendor
ME
multicluster engine for Kubernetes 2.9 · Red Hat
All versions, or not specified · source: vendor
Affected product
ME
multicluster engine for Kubernetes 2.10
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73267
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73267
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:59556
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:59557
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:59558
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:59559
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:59579
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:59593
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