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Vulnerability record · CVE-2026-54342 · published 24 July 2026

CVE-2026-54342: Improper certificate validation vulnerability

In epa4all, prior to version 2026-05-20, an attacker on the network path between epa4all and any backend (ePA Aktensystem, Konnektor, IDP, TSS) can present a self-signed TLS certificate and intercept the connection. For non-VAU connections (Konnektor, IDP), this allows direct read and modification of the inner traffic, including smartcard operations and OIDC authentication exchanges. For the ePA backend, the disabled TLS verification is the transport-level enabler for the VAU MITM described in GHSA-vvh7-x6c7-46gh. This issue has been patched in version 2026-05-20.

8.1 CVSS 3.1 High EPSS 0.20% · top 91.6% CWE-295 · Improper certificate validation Deferred
8.1CVSS 3.1 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
30 Jul 2026Last modified by NVD

Description

In epa4all, prior to version 2026-05-20, an attacker on the network path between epa4all and any backend (ePA Aktensystem, Konnektor, IDP, TSS) can present a self-signed TLS certificate and intercept the connection. For non-VAU connections (Konnektor, IDP), this allows direct read and modification of the inner traffic, including smartcard operations and OIDC authentication exchanges. For the ePA backend, the disabled TLS verification is the transport-level enabler for the VAU MITM described in GHSA-vvh7-x6c7-46gh. This issue has been patched in version 2026-05-20.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

LinkTags
https://github.com/med-united/epa4all/releases/tag/2026-05-20
https://github.com/med-united/epa4all/security/advisories/GHSA-296w-v8f6-3rf7
https://github.com/med-united/epa4all/security/advisories/GHSA-vvh7-x6c7-46gh
https://www.machinespirits.com/advisory/b98b02

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Source: NIST National Vulnerability Database (record CVE-2026-54342), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.