{"id":"CVE-2026-45575","state":"PUBLISHED","title":"epa4all-client: Improper Verification of Cryptographic Signature","description":"epa4all-client is the Java Client for epa4all / ePA 3.0 in the Telematik Infrastruktur. Prior to 1.2.2, an attacker who can MITM the TLS connection between the client and the IDP (within the TI network) can substitute a forged discovery document. The forged document redirects uri_puk_idp_enc and uri_puk_idp_sig to attacker-controlled URLs. The client then encrypts the SMC-B-signed challenge response to the attacker's encryption key and POSTs it to the attacker's auth endpoint. This captures the signed authentication material. This vulnerability is fixed in 1.2.2.","publishedAt":"2026-05-26T21:01:51.745Z","updatedAt":"2026-05-28T14:11:30.565Z","severity":{"score":7.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["oviva-ag epa4all-client","com.oviva.telematik epa4all-client"],"affected":[{"vendor":"oviva-ag","product":"epa4all-client","versions":[{"version":"< 1.2.2","status":"affected"}]},{"vendor":"com.oviva.telematik","product":"epa4all-client","versions":[{"version":"< 1.2.2","status":"affected"}]}],"references":["https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf","https://github.com/oviva-ag/epa4all-client/pull/36"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45575.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45575","state":"PUBLISHED","datePublished":"2026-05-26T21:01:51.745Z","dateUpdated":"2026-05-28T14:11:30.565Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-12T19:00:14.600Z"},"containers":{"cna":{"title":"epa4all-client: Improper Verification of Cryptographic Signature","descriptions":[{"lang":"en","value":"epa4all-client is the Java Client for epa4all / ePA 3.0 in the Telematik Infrastruktur. Prior to 1.2.2, an attacker who can MITM the TLS connection between the client and the IDP (within the TI network) can substitute a forged discovery document. The forged document redirects uri_puk_idp_enc and uri_puk_idp_sig to attacker-controlled URLs. The client then encrypts the SMC-B-signed challenge response to the attacker's encryption key and POSTs it to the attacker's auth endpoint. This captures the signed authentication material. This vulnerability is fixed in 1.2.2."}],"affected":[{"vendor":"oviva-ag","product":"epa4all-client","versions":[{"version":"< 1.2.2","status":"affected"}]},{"vendor":"com.oviva.telematik","product":"epa4all-client","versions":[{"version":"< 1.2.2","status":"affected"}]}],"references":[{"url":"https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf","name":"https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/oviva-ag/epa4all-client/pull/36","name":"https://github.com/oviva-ag/epa4all-client/pull/36","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-26T21:01:51.745Z"},"source":{"advisory":"GHSA-gqx7-6552-67hf","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-28T14:11:18.105155Z","id":"CVE-2026-45575","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-28T14:11:30.565Z"}}]}}}