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.
History

Thu, 13 Aug 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat multicluster Engine For Kubernetes
Vendors & Products Redhat multicluster Engine For Kubernetes

Thu, 13 Aug 2026 17:00:00 +0000

Type Values Removed Values Added
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.
Title Clusterclaims-controller: clusterclaims-controller: tenant-controlled clusterclaim labels propagated to managedcluster enabling cross-tenant managedclusterset join
First Time appeared Redhat
Redhat multicluster Engine
Weaknesses CWE-441
CPEs cpe:/a:redhat:multicluster_engine
Vendors & Products Redhat
Redhat multicluster Engine
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-13T16:36:45.097Z

Reserved: 2026-08-11T17:22:38.645Z

Link: CVE-2026-73266

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-13T17:17:35.713

Modified: 2026-08-13T17:17:35.713

Link: CVE-2026-73266

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T20:15:03Z