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  4. CVE 2026 52723 epa 3x integration vau server authentication
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Back to active CVEs
Critical · CVSS 9.1CVE-2026-52723

ePA 3.x Integration: VAU Server Authentication Bypass via Circular Certificate Trust

Answer in brief

CVE-2026-52723 records a Critical severity (CVSS 9.1) vulnerability in ePA 3.x Integration: VAU Server Authentication Bypass via Circular Certificate Trust. The current sources do not mark it as known exploited. The current feed maps fbeta-GmbH/ePA3-Service-OpenSource (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 18, 2026Updated Sep 8, 2026Source checked Oct 2, 2026First seen by HOL Aug 18, 2026Material review Sep 8, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps fbeta-GmbH/ePA3-Service-OpenSource (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
fbeta-GmbH/ePA3-Service-OpenSourcegeneric<1.3.01.3.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for fbeta-GmbH/ePA3-Service-OpenSource.
  2. 2Review the reported fix. Update fbeta-GmbH/ePA3-Service-OpenSource to 1.3.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 18, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 18, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencemachinespirits.de
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-295
Source
CVE List V5
Source checked
Oct 2, 2026
References
5 linked sources
Open source record