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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73266
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-13 17:17:35 UTC
Updated2026-08-25 21:17:45 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

EPSS: 0.002150000 probability, percentile 0.117450000 (date 2026-08-26)

Problem Types: CWE-441 | CWE-441 Unintended Proxy or Intermediary ('Confused Deputy')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
3.1CNACVSS7.1HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Multicluster Engine For Kubernetes 2.11 unaffected 1787239442 * rpm Not specified
CNA Red Hat Multicluster Engine For Kubernetes 2.17 unaffected 1786577950 * rpm Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:59593 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:59556 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/security/cve/CVE-2026-73266 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-08-10T00:00:00.000ZReported to Red Hat.
CNA2026-08-11T00:00:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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