epa4all-client: Improper Verification of Cryptographic Signature_CVE-2026-45575

7.4 / 10

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Basic Information

ID CVE-2026-45575

Source GitHub_M

Published May 26, 2026 at 21:01

Affected Product

Vendor oviva-ag

Product epa4all-client

Version < 1.2.2

Affected Versions oviva-ag epa4all-client < 1.2.2
com.oviva.telematik epa4all-client < 1.2.2

CWE Classification

CWE-347

References

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    "published": "2026-05-26T21:01:51.745Z",
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