CVE-2026-73266

HIGH 7.1

Clusterclaims-controller: confused deputy: tenant-controlled clusterclaim labels propagated to managedcluster, enabling cross-tenant managedclusterset join

CVSS Score

7.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-441
Vendor	red hat
Product	multicluster engine for kubernetes 2.1
Published	Aug 13, 2026
Last Updated	Sep 8, 2026

Stay Ahead of the Next One

Get instant alerts for red hat multicluster engine for kubernetes 2.1

Be the first to know when new high vulnerabilities affecting red hat multicluster engine for kubernetes 2.1 are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

None

Affected Versions

Red Hat / multicluster engine for Kubernetes 2.1

All versions affected

Red Hat / multicluster engine for Kubernetes 2.11

All versions affected

Red Hat / multicluster engine for Kubernetes 2.17

All versions affected

Red Hat / multicluster engine for Kubernetes 2.6

All versions affected

Red Hat / multicluster engine for Kubernetes 2.8

All versions affected

Red Hat / multicluster engine for Kubernetes 2.9

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗