CVE-2026-73267 Missing authorization in multicluster engine for Kubernetes 2.10
A tenant can delete any ManagedCluster, including the hub's local cluster, by manipulating the ClusterClaim namespace field due to missing ownership checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73267?
CVE-2026-73267 is a high-severity missing authorization vulnerability in Red Hat multicluster engine for Kubernetes 2.10, published on 21 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-602
Which versions are affected by CVE-2026-73267?
How do I fix CVE-2026-73267?
No fix has been published for CVE-2026-73267 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-73267 being exploited?
There is no known exploitation of CVE-2026-73267 in the wild and no public exploit code.
Sources
Also known as GHSA-q3cg-8r2r-6g4g.