CVE-2026-45575
epa4all-client: Improper Verification of Cryptographic Signature
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
2th
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.
| CWE | CWE-347 |
| Vendor | oviva-ag |
| Product | epa4all-client |
| Published | May 26, 2026 |
| Last Updated | May 28, 2026 |
Stay Ahead of the Next One
Get instant alerts for oviva-ag epa4all-client
Be the first to know when new high vulnerabilities affecting oviva-ag epa4all-client are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
oviva-ag / epa4all-client
< 1.2.2
com.oviva.telematik / epa4all-client
< 1.2.2