CVE-2026-73266 Missing authorization in multicluster engine for Kubernetes 2.10
Authenticated tenants can manipulate labels to join other tenants' cluster sets, enabling unauthorized policy and workload injection.
- 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-2026-73266?
CVE-2026-73266 is a high-severity missing authorization vulnerability in Red Hat multicluster engine for Kubernetes 2.10, published on 13 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). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.
Weakness: CWE-441
Which versions are affected by CVE-2026-73266?
How do I fix CVE-2026-73266?
No fix has been published for CVE-2026-73266 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-2026-73266 being exploited?
There is no known exploitation of CVE-2026-73266 in the wild and no public exploit code.
Sources
Also known as GHSA-xp42-v53j-r9gh.