Vulnerability details
CVE-2026-45575
com.oviva.telematik epa4all-clientoviva-ag epa4all-client
epa4all-client: Improper Verification of Cryptographic Signature
CVSS 3.1
7.4High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.4High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| com.oviva.telematik | epa4all-client | < 1.2.2 | CVEProject cvelistV5 (CNA) |
| oviva-ag | epa4all-client | < 1.2.2 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf x_refsource_CONFIRM
- https://github.com/oviva-ag/epa4all-client/pull/36 x_refsource_MISC
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Details
- Published
- 2026-05-27
- Last updated
- 2026-05-28
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.11%
Probability of exploitation in 30 days
1.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-347Improper Verification of Cryptographic Signature