CVE-2026-52723

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{"affected": [{"affectedData": [{"product": "ePA3-Service-OpenSource", "vendor": "fbeta-GmbH", "versions": [{"status": "affected", "version": "< 1.3.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "ePA 3.x Integration implements the authorization workflow and writes Medical Information Objects to Germany's electronic patient record. Prior to 1.3.0, ePA 3.x Integration performs VAU server certificate validation in app/vau/VAUProtokoll.py without anchoring the signed_vau_server_pub_keys and AUT_VAU_CertData certificate path to independent trusted material. A network-positioned attacker between the DiGA backend and the ePA system can intercept the VAU handshake, supply attacker-controlled certificate and key material, and satisfy the circular trust relationship. Because TLS certificate verification is also disabled in affected versions, no independent server-authentication layer prevents the attack. The attacker can impersonate the VAU server, control the negotiated session keys, and read or modify all encrypted VAU traffic. This issue is fixed in version 1.3.0."}, {"lang": "es", "value": "La Integraci\u00f3n de ePA 3.x implementa el flujo de trabajo de autorizaci\u00f3n y escribe Objetos de Informaci\u00f3n M\u00e9dica en el historial electr\u00f3nico del paciente de Alemania. Antes de la versi\u00f3n 1.3.0, la Integraci\u00f3n de ePA 3.x realiza la validaci\u00f3n del certificado del servidor VAU en app/vau/VAUProtokoll.py sin anclar la ruta del certificado signed_vau_server_pub_keys y AUT_VAU_CertData a material de confianza independiente. Un atacante posicionado en la red entre el backend de DiGA y el sistema ePA puede interceptar el handshake VAU, suministrar material de certificado y clave controlado por el atacante, y satisfacer la relaci\u00f3n de confianza circular. Debido a que la verificaci\u00f3n del certificado TLS tambi\u00e9n est\u00e1 deshabilitada en las versiones afectadas, ninguna capa independiente de autenticaci\u00f3n del servidor previene el ataque. El atacante puede suplantar al servidor VAU, controlar las claves de sesi\u00f3n negociadas y leer o modificar todo el tr\u00e1fico VAU cifrado. Este problema est\u00e1 solucionado en la versi\u00f3n 1.3.0."}], "id": "CVE-2026-52723", "lastModified": "2026-10-22T22:10:00.250", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52723", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-18T17:38:28.386866Z", "version": "2.0.3"}}]}, "published": "2026-08-18T17:16:59.200", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/fbeta-GmbH/ePA3-Service-OpenSource/commit/197c8c7fc41675f19c7f448696a2bc63fab9db5b"}, {"source": "security-advisories@github.com", "url": "https://github.com/fbeta-GmbH/ePA3-Service-OpenSource/pull/12"}, {"source": "security-advisories@github.com", "url": "https://github.com/fbeta-GmbH/ePA3-Service-OpenSource/releases/tag/1.3.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/fbeta-GmbH/ePA3-Service-OpenSource/security/advisories/GHSA-q2jw-6c4w-86jc"}, {"source": "security-advisories@github.com", "url": "https://www.machinespirits.de/advisory/a1da93"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.3.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "ePA3-Service-OpenSource", "source": "cna", "vendor": "fbeta-GmbH"}, "product": "epa3-service-opensource", "vendor": "fbeta-gmbh"}], "created": "2026-08-18T18:45:03.369034+00:00", "updated": "2026-08-21T12:33:02.023656+00:00", "vendors": ["fbeta-gmbh", "fbeta-gmbh$PRODUCT$epa3-service-opensource"]}