What’s Vulnerable › Vulnerabilities

CVE-2026-45575: epa4all-client: Improper Verification of Cryptographic Signature

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-26 · updated 2026-07-24
• Weakness: CWE-347

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.

Affected products

• com.oviva.telematik epa4all-client: before 1.2.2
• oviva-ag epa4all-client: before 1.2.2

References

• 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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