Vulnerabilities CVE-2026-73266

CVE-2026-73266

High

Open

TLP:CLEAR

Clusterclaims-controller: clusterclaims-controller: tenant-controlled clusterclaim labels propagated to managedcluster enabling cross-tenant managedclusterset join

NVD CVE.org

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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.

Details

CVSS Score: 7.1
EPSS Score ⓘ: 0.16%

5.7th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Confidence: 90%
Published: Aug 13, 2026
Last Modified: Aug 18, 2026

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