CVE-2026-45575

epa4all-client: Improper Verification of Cryptographic Signature

Published May 26, 2026 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-gqx7-6552-67hf Improper Verification of Cryptographic Signature in com.oviva.telematik:epa4all-client
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Com.oviva.telematik
Com.oviva.telematik epa4all-client
Oviva-ag
Oviva-ag epa4all-client
Vendors & Products Com.oviva.telematik
Com.oviva.telematik epa4all-client
Oviva-ag
Oviva-ag epa4all-client
Type Values Removed Values Added
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.
Title epa4all-client: Improper Verification of Cryptographic Signature
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 28, 2026, 2:11 PM
Reserved
May 12, 2026, 7:00 PM
Status
Deferred
Published
May 26, 2026, 9:16 PM
Modified
Jul 24, 2026, 11:10 AM