CVE-2026-73266
High
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.
SeverityHigh
CVSS7.1
Exploit probability—
ProductMulticluster Engine 2.10
PublishedAug 13, 2026
First seenAug 13, 2026
Weakness typeCWE-441CWE-441
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| multicluster_engine 2.10 | No range specified | — |
| multicluster_engine 2.11 | No range specified | — |
| multicluster_engine 2.17 | No range specified | — |
| multicluster_engine 2.6 | No range specified | — |
| multicluster_engine 2.8 | No range specified | — |
| multicluster_engine 2.9 | No range specified | — |
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