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CVE-2026-52723— ePA 3.x Integration: VAU Server Authentication Bypass via Circular Certificate Trust

Quick assessment

Affected
fbeta-GmbH ePA3-Service-OpenSource
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

fbeta ePA 3.x Integration是德国fbeta公司的一款Web服务集成组件。 fbeta ePA 3.x Integration 1.3.0之前版本存在加密问题漏洞，该漏洞源于对VAU服务器证书验证不当，未将证书路径锚定到独立可信材料，且TLS证书验证被禁用，可能导致网络攻击者冒充VAU服务器，控制会话密钥并读取或修改加密流量。

CVSS 9.1 · Critical EPSS 0.22% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
fbeta-GmbH ePA3-Service-OpenSource < 1.3.0 affected
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I. Basic Information for CVE-2026-52723

Vulnerability Information
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Vulnerability Title
ePA 3.x Integration: VAU Server Authentication Bypass via Circular Certificate Trust
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
fbeta ePA 3.x Integration 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
fbeta ePA 3.x Integration是德国fbeta公司的一款Web服务集成组件。 fbeta ePA 3.x Integration 1.3.0之前版本存在加密问题漏洞，该漏洞源于对VAU服务器证书验证不当，未将证书路径锚定到独立可信材料，且TLS证书验证被禁用，可能导致网络攻击者冒充VAU服务器，控制会话密钥并读取或修改加密流量。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fbeta-GmbH ePA3-Service-OpenSource < 1.3.0 -

II. Public POCs for CVE-2026-52723

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 12598 chars
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III. Intelligence Information for CVE-2026-52723

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Patches & Fixes for CVE-2026-52723 (2)

Vendor Advisories for CVE-2026-52723 (2)

Other References for CVE-2026-52723 (1)

Same Patch Batch · fbeta-GmbH · 2026-08-18 · 4 CVEs total

CVE-2026-50578 7.5 HIGH ePA 3.x Integration: TLS Certificate Verification Universally Disabled
CVE-2026-50577 7.4 HIGH ePA 3.x Integration: AES-GCM Nonce Reuse via Frozen VAU Request Counter
CVE-2026-50576 6.8 MEDIUM ePA 3.x Integration: HTTP Header Injection in VAU Inner Requests

IV. Related Vulnerabilities

Same product: ePA3-Service-OpenSource
Same vendor: fbeta-GmbH
Same weakness: CWE-295

V. Comments for CVE-2026-52723

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