CVE-2026-66794

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66794", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-07-27T17:51:24.886Z", "datePublished": "2026-08-19T17:30:07.984Z", "dateUpdated": "2026-09-29T19:41:11.722Z"}, "containers": {"cna": {"title": "Cluster-proxy-addon: cluster-proxy-addon: unauthenticated ssrf to arbitrary managed-cluster services via public route", "metrics": [{"other": {"content": {"value": "Important", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/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 `cluster-proxy-addon` component of Multicluster Engine for Kubernetes. This vulnerability allows an unauthenticated attacker, who can access the user-facing route, to bypass authentication and authorization checks. By manipulating URL path segments, the attacker can proxy requests to arbitrary services across any managed cluster. This enables unauthorized access to internal services that would otherwise be protected, potentially leading to information disclosure or further compromise of the cluster environment."}], "affected": [{"vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.10", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "defaultStatus": "affected", "versions": [{"version": "1787173361", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:multicluster_engine:2.10::el9"]}, {"vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.11", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "multicluster-engine/cluster-proxy-rhel9", "defaultStatus": "affected", "versions": [{"version": "1787276784", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:multicluster_engine:2.11::el9"]}, {"vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.17", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "multicluster-engine/cluster-proxy-rhel9", "defaultStatus": "affected", "versions": [{"version": "1786983349", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:multicluster_engine:2.17::el9"]}, {"vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.6", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "defaultStatus": "affected", "versions": [{"version": "1787275318", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:multicluster_engine:2.6::el9"]}, {"vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.8", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "defaultStatus": "affected", "versions": [{"version": "1787275519", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:multicluster_engine:2.8::el9"]}, {"vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.9", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "defaultStatus": "affected", "versions": [{"version": "1787274923", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:multicluster_engine:2.9::el9"]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:59556", "name": "RHSA-2026:59556", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:59557", "name": "RHSA-2026:59557", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:59558", "name": "RHSA-2026:59558", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:59559", "name": "RHSA-2026:59559", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:59579", "name": "RHSA-2026:59579", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:59593", "name": "RHSA-2026:59593", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/security/cve/CVE-2026-66794", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507539", "name": "RHBZ#2507539", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-08-19T14:00:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-918", "description": "Server-Side Request Forgery (SSRF)", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-918: Server-Side Request Forgery (SSRF)", "workarounds": [{"lang": "en", "value": "To mitigate this issue, restrict network access to the user-facing Route of the `cluster-proxy-addon` to trusted networks only. Implement firewall rules to limit inbound connections to the Route's exposed port, ensuring only authorized sources can reach it. This reduces the attack surface by preventing unauthenticated external access to the vulnerable proxy."}], "timeline": [{"lang": "en", "time": "2026-07-27T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-08-19T14:00:00.000Z", "value": "Made public."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-09-29T19:41:11.722Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-21T19:33:05.335178Z", "id": "CVE-2026-66794", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-21T19:33:17.053Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-66794", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-21T19:33:05.335178Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-21T19:33:13.505Z"}}], "cna": {"title": "Cluster-proxy-addon: cluster-proxy-addon: unauthenticated ssrf to arbitrary managed-cluster services via public route", "metrics": [{"other": {"type": "Red Hat severity rating", "content": {"value": "Important", "namespace": "https://access.redhat.com/security/updates/classification/"}}}, {"format": "CVSS", "cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.3, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}], "affected": [{"cpes": ["cpe:/a:redhat:multicluster_engine:2.10::el9"], "vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.10", "versions": [{"status": "unaffected", "version": "1787173361", "lessThan": "*", "versionType": "rpm"}], "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:multicluster_engine:2.11::el9"], "vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.11", "versions": [{"status": "unaffected", "version": "1787276784", "lessThan": "*", "versionType": "rpm"}], "packageName": "multicluster-engine/cluster-proxy-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:multicluster_engine:2.17::el9"], "vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.17", "versions": [{"status": "unaffected", "version": "1786983349", "lessThan": "*", "versionType": "rpm"}], "packageName": "multicluster-engine/cluster-proxy-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:multicluster_engine:2.6::el9"], "vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.6", "versions": [{"status": "unaffected", "version": "1787275318", "lessThan": "*", "versionType": "rpm"}], "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:multicluster_engine:2.8::el9"], "vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.8", "versions": [{"status": "unaffected", "version": "1787275519", "lessThan": "*", "versionType": "rpm"}], "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:multicluster_engine:2.9::el9"], "vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.9", "versions": [{"status": "unaffected", "version": "1787274923", "lessThan": "*", "versionType": "rpm"}], "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}], "timeline": [{"lang": "en", "time": "2026-07-27T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-08-19T14:00:00.000Z", "value": "Made public."}], "datePublic": "2026-08-19T14:00:00.000Z", "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:59556", "name": "RHSA-2026:59556", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:59557", "name": "RHSA-2026:59557", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:59558", "name": "RHSA-2026:59558", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:59559", "name": "RHSA-2026:59559", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:59579", "name": "RHSA-2026:59579", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:59593", "name": "RHSA-2026:59593", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/security/cve/CVE-2026-66794", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507539", "name": "RHBZ#2507539", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "workarounds": [{"lang": "en", "value": "To mitigate this issue, restrict network access to the user-facing Route of the `cluster-proxy-addon` to trusted networks only. Implement firewall rules to limit inbound connections to the Route's exposed port, ensuring only authorized sources can reach it. This reduces the attack surface by preventing unauthenticated external access to the vulnerable proxy."}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in the `cluster-proxy-addon` component of Multicluster Engine for Kubernetes. This vulnerability allows an unauthenticated attacker, who can access the user-facing route, to bypass authentication and authorization checks. By manipulating URL path segments, the attacker can proxy requests to arbitrary services across any managed cluster. This enables unauthorized access to internal services that would otherwise be protected, potentially leading to information disclosure or further compromise of the cluster environment."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-918", "description": "Server-Side Request Forgery (SSRF)"}]}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-09-29T19:41:11.722Z"}, "x_redhatCweChain": "CWE-918: Server-Side Request Forgery (SSRF)"}}, "cveMetadata": {"cveId": "CVE-2026-66794", "state": "PUBLISHED", "dateUpdated": "2026-09-29T19:41:11.722Z", "dateReserved": "2026-07-27T17:51:24.886Z", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "datePublished": "2026-08-19T17:30:07.984Z", "assignerShortName": "redhat"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": ["cpe:/a:redhat:multicluster_engine:2.10::el9"], "defaultStatus": "affected", "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "product": "multicluster engine for Kubernetes 2.10", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "1787173361", "versionType": "rpm"}]}, {"collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": ["cpe:/a:redhat:multicluster_engine:2.11::el9"], "defaultStatus": "affected", "packageName": "multicluster-engine/cluster-proxy-rhel9", "product": "multicluster engine for Kubernetes 2.11", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "1787276784", "versionType": "rpm"}]}, {"collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": ["cpe:/a:redhat:multicluster_engine:2.17::el9"], "defaultStatus": "affected", "packageName": "multicluster-engine/cluster-proxy-rhel9", "product": "multicluster engine for Kubernetes 2.17", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "1786983349", "versionType": "rpm"}]}, {"collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": ["cpe:/a:redhat:multicluster_engine:2.6::el9"], "defaultStatus": "affected", "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "product": "multicluster engine for Kubernetes 2.6", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "1787275318", "versionType": "rpm"}]}, {"collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": ["cpe:/a:redhat:multicluster_engine:2.8::el9"], "defaultStatus": "affected", "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "product": "multicluster engine for Kubernetes 2.8", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "1787275519", "versionType": "rpm"}]}, {"collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": ["cpe:/a:redhat:multicluster_engine:2.9::el9"], "defaultStatus": "affected", "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "product": "multicluster engine for Kubernetes 2.9", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "1787274923", "versionType": "rpm"}]}], "source": "secalert@redhat.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in the `cluster-proxy-addon` component of Multicluster Engine for Kubernetes. This vulnerability allows an unauthenticated attacker, who can access the user-facing route, to bypass authentication and authorization checks. By manipulating URL path segments, the attacker can proxy requests to arbitrary services across any managed cluster. This enables unauthorized access to internal services that would otherwise be protected, potentially leading to information disclosure or further compromise of the cluster environment."}, {"lang": "es", "value": "Se encontr\u00f3 una falla en el componente \u2019cluster-proxy-addon\u2019 de Multicluster Engine para Kubernetes. Esta vulnerabilidad permite a un atacante no autenticado, que puede acceder a la ruta orientada al usuario, eludir las comprobaciones de autenticaci\u00f3n y autorizaci\u00f3n. Al manipular segmentos de la ruta URL, el atacante puede hacer proxy de solicitudes a servicios arbitrarios en cualquier cl\u00faster gestionado. Esto permite el acceso no autorizado a servicios internos que de otro modo estar\u00edan protegidos, lo que podr\u00eda llevar a la revelaci\u00f3n de informaci\u00f3n o a un compromiso adicional del entorno del cl\u00faster."}], "id": "CVE-2026-66794", "lastModified": "2026-10-26T11:10:00.157", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.7, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-66794", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-21T19:33:05.335178Z", "version": "2.0.3"}}]}, "published": "2026-08-19T18:17:16.547", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:59556"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:59557"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:59558"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:59559"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:59579"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:59593"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-66794"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507539"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"bugzilla": {"description": "cluster-proxy-addon: cluster-proxy-addon: unauthenticated SSRF to arbitrary managed-cluster services via public Route", "id": "2507539", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507539"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N", "status": "draft"}, "cwe": "CWE-918", "details": ["A flaw was found in the `cluster-proxy-addon` component of Multicluster Engine for Kubernetes. This vulnerability allows an unauthenticated attacker, who can access the user-facing route, to bypass authentication and authorization checks. By manipulating URL path segments, the attacker can proxy requests to arbitrary services across any managed cluster. This enables unauthorized access to internal services that would otherwise be protected, potentially leading to information disclosure or further compromise of the cluster environment."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, restrict network access to the user-facing Route of the `cluster-proxy-addon` to trusted networks only. Implement firewall rules to limit inbound connections to the Route's exposed port, ensuring only authorized sources can reach it. This reduces the attack surface by preventing unauthenticated external access to the vulnerable proxy."}, "name": "CVE-2026-66794", "package_state": [{"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "package_name": "multicluster-engine/cluster-proxy-addon-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "package_name": "multicluster-engine/cluster-proxy-rhel9", "product_name": "Multicluster Engine for Kubernetes"}], "public_date": "2026-08-19T14:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-66794\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-66794"], "statement": "This Critical vulnerability in the `cluster-proxy-addon` for Multicluster Engine for Kubernetes allows an unauthenticated attacker to perform Server-Side Request Forgery (SSRF). By exploiting the user-facing Route, which lacks proper authentication and authorization, an attacker can proxy requests to arbitrary services across any managed cluster, including internal services that are not otherwise exposed.", "threat_severity": "Important"}

{"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": "2026-08-20T01:30:03.580724+00:00", "updated": "2026-08-20T13:30:17.737392+00:00", "vendors": ["redhat", "redhat$PRODUCT$multicluster_engine_for_kubernetes"]}