CVE-2026-73266Clusterclaims-controller: confused deputy: tenant-controlled clusterclaim labels propagated to managedcluster, enabling cross-tenant managedclusterset join
Updated under an hour ago ()
Does this affect you?
It affects Red Hat multicluster engine for Kubernetes 2.10. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
- Weakness (CWE)
- CWE-441
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 29, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat multicluster engine for Kubernetes 2.10 redhat:multicluster_engine | from 1787196014 not affected | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:59556vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:59557vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:59558vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:59559vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:59579vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:59593vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-73266vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2514217issue-tracking, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.