CVE-2026-73266: Unintended Proxy or Intermediary ('Confused Deputy') in Red Hat Multicluster Engine for Kubernetes
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.
CVE-2026-73266: Unintended Proxy or Intermediary ('Confused Deputy') in Red Hat Multicluster Engine for Kubernetes
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.
CVSS v3.1
Score 7.1high
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-08-11T17:22:38.645Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-73266","vendor":"Red Hat"}]
Threat ID: 6a7dfaf5bf8831d53980f1f5
Added to database: 08/13/2026, 17:12:21 UTC
Last updated: 08/13/2026, 17:12:21 UTC
Views: 1
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