CVE-2026-73266
Clusterclaims-controller: confused deputy: tenant-controlled clusterclaim labels propagated to managedcluster, enabling cross-tenant managedclusterset join
- State
- Published
- Severity
- 7.1 High
- Published
- Aug 13, 2026
- Updated
- Sep 29, 2026
- Reserved
- Aug 11, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.1 High | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N | redhat |
Weaknesses
- CWE-441 Unintended Proxy or Intermediary ('Confused Deputy')
Affected Products
| Product | Versions |
|---|---|
multicluster engine for Kubernetes 2.10Red Hat |
|
multicluster engine for Kubernetes 2.11Red Hat |
|
multicluster engine for Kubernetes 2.17Red Hat |
|
multicluster engine for Kubernetes 2.6Red Hat |
|
multicluster engine for Kubernetes 2.8Red Hat |
|
multicluster engine for Kubernetes 2.9Red Hat |
|
References
- RHSA-2026:59556vendor-advisory
- RHSA-2026:59557vendor-advisory
- RHSA-2026:59558vendor-advisory
- RHSA-2026:59559vendor-advisory
- RHSA-2026:59579vendor-advisory
- RHSA-2026:59593vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-73266vdb-entry
- RHBZ#2514217issue-tracking
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