{"id":"GHSA-gqx7-6552-67hf","summary":"Improper Verification of Cryptographic Signature in com.oviva.telematik:epa4all-client","details":"### Impact\nAn 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 u ri_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.\n\n### Patches\n[#36](https://github.com/oviva-ag/epa4all-client/pull/36)\n\n### Workarounds\nNone.\n\n### Resources\n- MS-OVIVA-EPA4ALL-d453c1\n\n### Credits\n[Machine Spirits](https://machinespirits.com/) ([contact@machinespirits.de](mailto:contact@machinespirits.de))\n\n- Dr. rer. nat. Simon Weber\n- Dipl.-Inf. Volker Schönefeld\n- Chiara Fliegner","aliases":["CVE-2026-45575"],"modified":"2026-06-08T23:45:13.399733147Z","published":"2026-05-15T18:30:48Z","database_specific":{"cwe_ids":["CWE-347"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-05-15T18:30:48Z","nvd_published_at":"2026-05-26T21:16:40Z"},"references":[{"type":"WEB","url":"https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45575"},{"type":"WEB","url":"https://github.com/oviva-ag/epa4all-client/pull/36"},{"type":"WEB","url":"https://github.com/oviva-ag/epa4all-client/commit/9111d6fbb939007036a7f74b2a93bb278cb5af32"},{"type":"PACKAGE","url":"https://github.com/oviva-ag/epa4all-client"},{"type":"WEB","url":"https://github.com/oviva-ag/epa4all-client/releases/tag/v1.2.2"}],"affected":[{"package":{"name":"com.oviva.telematik:epa4all-client","ecosystem":"Maven","purl":"pkg:maven/com.oviva.telematik/epa4all-client"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.2"}]}],"versions":["0.0.2-rc.0","0.0.4","0.0.5","0.0.7","0.0.8","1.0.0","1.0.2","1.0.3","1.1.0","1.1.1","1.2.0","1.2.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-gqx7-6552-67hf/GHSA-gqx7-6552-67hf.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}