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CVE-2026-52723: CWE-295: Improper Certificate Validation in fbeta-GmbH ePA3-Service-OpenSource

0
Critical
VulnerabilityCVE-2026-52723cvecve-2026-52723cwe-295
Published: 08/18/2026 (08/18/2026, 16:50:49 UTC)
Source: CVE Database V5
Vendor/Project: fbeta-GmbH
Product: ePA3-Service-OpenSource

Description

ePA 3.x Integration implements the authorization workflow and writes Medical Information Objects to Germany's electronic patient record. Prior to 1.3.0, ePA 3.x Integration performs VAU server certificate validation in app/vau/VAUProtokoll.py without anchoring the signed_vau_server_pub_keys and AUT_VAU_CertData certificate path to independent trusted material. A network-positioned attacker between the DiGA backend and the ePA system can intercept the VAU handshake, supply attacker-controlled certificate and key material, and satisfy the circular trust relationship. Because TLS certificate verification is also disabled in affected versions, no independent server-authentication layer prevents the attack. The attacker can impersonate the VAU server, control the negotiated session keys, and read or modify all encrypted VAU traffic. This issue is fixed in version 1.3.0.

CVSS v3.1

Score 9.1critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Technical Details

Data Version
5.2
Assigner Short Name
GitHub_M
Date Reserved
2026-06-08T14:00:43.571Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a84946ac6e8be0332857116

Added to database: 08/18/2026, 17:20:42 UTC

Last updated: 08/18/2026, 17:20:42 UTC

Views: 1

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