7.1High
CVE-2026-73266Clusterclaims-controller: confused deputy: tenant-controlled clusterclaim labels propagated to managedcluster, enabling cross-tenant managedclusterset join
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):
CWE-441
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| multicluster engine | 2.10 | — | |
| multicluster engine | 2.11 | — | |
| multicluster engine | 2.17 | — | |
| multicluster engine | 2.6 | — | |
| multicluster engine | 2.8 | — | |
| multicluster engine | 2.9 | — | |
| Red Hat | multicluster engine for Kubernetes 2.10 | all versions | |
| Red Hat | multicluster engine for Kubernetes 2.11 | all versions | |
| Red Hat | multicluster engine for Kubernetes 2.17 | all versions | |
| Red Hat | multicluster engine for Kubernetes 2.6 | all versions | |
| Red Hat | multicluster engine for Kubernetes 2.8 | all versions | |
| Red Hat | multicluster engine for Kubernetes 2.9 | all versions |
References and patches
- RHSA-2026:59556 vendor-advisory
- RHSA-2026:59557 vendor-advisory
- RHSA-2026:59558 vendor-advisory
- RHSA-2026:59559 vendor-advisory
- RHSA-2026:59579 vendor-advisory
- RHSA-2026:59593 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-73266 vdb-entry
- RHBZ#2514217 issue-tracking