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{"affected": [{"affectedData": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:multicluster_engine"], "defaultStatus": "affected", "packageName": "multicluster-engine/cluster-proxy-addon-rhel9", "product": "Multicluster Engine for Kubernetes", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:multicluster_engine"], "defaultStatus": "affected", "packageName": "multicluster-engine/cluster-proxy-rhel9", "product": "Multicluster Engine for Kubernetes", "vendor": "Red Hat"}], "source": "[email protected]"}], "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."}], "id": "CVE-2026-66794", "lastModified": "2026-08-19T18:17:16.547", "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": "[email protected]", "type": "Primary"}]}, "published": "2026-08-19T18:17:16.547", "references": [{"source": "[email protected]", "url": "https://access.redhat.com/security/cve/CVE-2026-66794"}, {"source": "[email protected]", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507539"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "[email protected]", "type": "Primary"}]}

{"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"}

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