CVE-2026-45575 Details
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.
A vulnerability exists in the oviva epa4all-client Java library, specifically in versions prior to 1.2.2. This issue allows an attacker to perform a man-in-the-middle (MITM) attack on the TLS connection between the client and the identity provider (IDP) within the Telematik Infrastruktur network. The attacker can substitute a forged discovery document that redirects certain URIs to attacker-controlled URLs. Consequently, the client encrypts a signed challenge response with the attacker's encryption key and sends it to the attacker's authentication endpoint, capturing the signed authentication material.
Users can upgrade to version 1.2.2 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 26, 2026CISA-ADP
Assessed May 28, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/oviva-ag/epa4all-client/pull/36 | [email protected] | Source CodeVendor |
| https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-347 | Improper Verification of Cryptographic Signature | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| oviva-ag epa4all-client | < 1.2.2 (semver) |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 26, 2026 | New CVE Received | [email protected] |