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.
Metrics
Affected Vendors & Products
References
History
Tue, 18 Aug 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
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ssvc
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Tue, 18 Aug 2026 17:00:00 +0000
| Type | Values Removed | Values Added |
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| 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. | |
| Title | ePA 3.x Integration: VAU Server Authentication Bypass via Circular Certificate Trust | |
| Weaknesses | CWE-295 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-08-18T17:38:36.332Z
Reserved: 2026-06-08T14:00:43.571Z
Link: CVE-2026-52723
Updated: 2026-08-18T17:38:32.347Z
Status : Received
Published: 2026-08-18T17:16:59.200
Modified: 2026-08-18T18:18:20.397
Link: CVE-2026-52723
No data.
OpenCVE Enrichment
Updated: 2026-08-18T18:45:03Z