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Vulnerability record · CVE-2026-45575 · published 26 May 2026

CVE-2026-45575: Improper verification of cryptographic signature vulnerability

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.

7.4 CVSS 3.1 High EPSS 0.15% · top 96.4% CWE-347 · Improper verification of cryptographic signature Deferred
7.4CVSS 3.1 base score
0.15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
24 Jul 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/oviva-ag/epa4all-client/pull/36
https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf

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Source: NIST National Vulnerability Database (record CVE-2026-45575), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.