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.
Published: 2026-08-13
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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History

Tue, 18 Aug 2026 02:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 14 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


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'}


Subscriptions

Redhat Multicluster Engine Multicluster Engine For Kubernetes
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-18T01:25:47.546Z

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

Link: CVE-2026-73266

cve-icon Vulnrichment

Updated: 2026-08-18T01:25:38.586Z

cve-icon NVD

Status : Awaiting Analysis

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

Modified: 2026-08-18T02:17:28.680

Link: CVE-2026-73266

cve-icon Redhat

Severity : Important

Publid Date: 2026-08-11T00:00:00Z

Links: CVE-2026-73266 - Bugzilla

cve-icon OpenCVE Enrichment

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

Weaknesses