What is CVE-2026-73266?

CVE-2026-73266 is a high-severity vulnerability in Red Hat Multicluster Engine For Kubernetes, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 7.1/10. Published 2026-08-13.

How severe is CVE-2026-73266?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in Red Hat Multicluster Engine For Kubernetes

CVE-2026-73266

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.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N.

Affected products

Red Hat Multicluster Engine For Kubernetes

Weakness classification (CWE)

CWE-441 — Unintended Proxy or Intermediary (Confused Deputy)

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-73266?: CVE-2026-73266 is a high-severity vulnerability in Red Hat Multicluster Engine For Kubernetes, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 7.1/10. Published 2026-08-13.
How severe is CVE-2026-73266?: High severity. CVSS v3 base score is 7.1 out of 10.