CVE-2026-52723: CWE-295: Improper Certificate Validation in fbeta-GmbH ePA3-Service-OpenSource
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.
AI Analysis
Technical Summary
The vulnerability arises from improper certificate validation in the ePA 3.x Integration component of the ePA3-Service-OpenSource product. Specifically, before version 1.3.0, the VAU server certificate validation in app/vau/VAUProtokoll.py does not anchor the signed VAU server public keys and AUT_VAU_CertData certificate path to independent trusted material. Additionally, TLS certificate verification is disabled, allowing a network-positioned attacker to intercept the VAU handshake, present attacker-controlled certificates, and satisfy the circular trust relationship. This enables the attacker to impersonate the VAU server, control session keys, and read or modify all encrypted VAU traffic. The vulnerability is addressed in version 1.3.0.
Potential Impact
An attacker positioned between the DiGA backend and the ePA system can intercept and manipulate the VAU handshake, impersonate the VAU server, and gain full access to encrypted VAU traffic. This compromises confidentiality and integrity of sensitive medical information exchanged in Germany's electronic patient record system. The vulnerability does not affect availability.
Mitigation Recommendations
This vulnerability is fixed in version 1.3.0 of ePA3-Service-OpenSource. Users should upgrade to version 1.3.0 or later to remediate the issue. No vendor advisory is provided to indicate alternative mitigations or temporary fixes. Patch status is not yet confirmed beyond the stated fix version; users should verify with the vendor for current remediation guidance.
CVE-2026-52723: CWE-295: Improper Certificate Validation in fbeta-GmbH 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
Affected software
pkg:github/fbeta-gmbh/ePA3-Service-OpenSourceRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability arises from improper certificate validation in the ePA 3.x Integration component of the ePA3-Service-OpenSource product. Specifically, before version 1.3.0, the VAU server certificate validation in app/vau/VAUProtokoll.py does not anchor the signed VAU server public keys and AUT_VAU_CertData certificate path to independent trusted material. Additionally, TLS certificate verification is disabled, allowing a network-positioned attacker to intercept the VAU handshake, present attacker-controlled certificates, and satisfy the circular trust relationship. This enables the attacker to impersonate the VAU server, control session keys, and read or modify all encrypted VAU traffic. The vulnerability is addressed in version 1.3.0.
Potential Impact
An attacker positioned between the DiGA backend and the ePA system can intercept and manipulate the VAU handshake, impersonate the VAU server, and gain full access to encrypted VAU traffic. This compromises confidentiality and integrity of sensitive medical information exchanged in Germany's electronic patient record system. The vulnerability does not affect availability.
Mitigation Recommendations
This vulnerability is fixed in version 1.3.0 of ePA3-Service-OpenSource. Users should upgrade to version 1.3.0 or later to remediate the issue. No vendor advisory is provided to indicate alternative mitigations or temporary fixes. Patch status is not yet confirmed beyond the stated fix version; users should verify with the vendor for current remediation guidance.
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 enriched: 08/18/2026, 17:34:40 UTC
Last updated: 09/03/2026, 22:52:12 UTC
Views: 53
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.