{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-73266", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-08-11T17:22:38.645Z", "datePublished": "2026-08-13T16:36:45.097Z", "dateUpdated": "2026-08-13T16:36:45.097Z"}, "containers": {"cna": {"title": "Clusterclaims-controller: clusterclaims-controller: tenant-controlled clusterclaim labels propagated to managedcluster enabling cross-tenant managedclusterset join", "metrics": [{"other": {"content": {"value": "Important", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"vendor": "Red Hat", "product": "Multicluster Engine for Kubernetes", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "multicluster-engine/clusterclaims-controller-rhel9", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:multicluster_engine"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-73266", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514217", "name": "RHBZ#2514217", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-08-11T00:00:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-441", "description": "Unintended Proxy or Intermediary ('Confused Deputy')", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')", "workarounds": [{"lang": "en", "value": "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."}], "timeline": [{"lang": "en", "time": "2026-08-10T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-08-11T00:00:00.000Z", "value": "Made public."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-08-13T16:36:45.097Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:multicluster_engine"], "defaultStatus": "affected", "packageName": "multicluster-engine/clusterclaims-controller-rhel9", "product": "Multicluster Engine for Kubernetes", "vendor": "Red Hat"}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-73266", "lastModified": "2026-08-13T17:17:35.713", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 4.7, "source": "[email protected]", "type": "Primary"}]}, "published": "2026-08-13T17:17:35.713", "references": [{"source": "[email protected]", "url": "https://access.redhat.com/security/cve/CVE-2026-73266"}, {"source": "[email protected]", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514217"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-441"}], "source": "[email protected]", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 99.0, "confidence_source": "matching", "scores": [{"score": 99.0, "source": "matching"}]}, "original": {"product": "Multicluster Engine for Kubernetes", "source": "cna", "vendor": "Red Hat"}, "product": "multicluster_engine_for_kubernetes", "vendor": "redhat"}], "created": "2026-08-13T19:15:03.453407+00:00", "updated": "2026-08-13T20:15:03.041952+00:00", "vendors": ["redhat", "redhat$PRODUCT$multicluster_engine_for_kubernetes"]}