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CVE-2026-44900— epa4all-client: VAU Signature bypass

Quick assessment

Affected
oviva-ag epa4all-client
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.

epa4all-client是Oviva AG开源的一个文档写入客户端工具。 epa4all-client 1.2.1之前版本存在信任管理问题漏洞，该漏洞源于SignedPublicKeysTrustValidatorImpl.isTrusted()中ECDSA签名验证丢弃Signature.verify()的布尔返回值，导致任何结构有效的签名均返回true。

CVSS 8.1 · High EPSS 0.12% · P2

Affected Version Matrix 2

VendorProduct Version RangeStatus
com.oviva.telematik epa4all-client < 1.2.1 affected
oviva-ag epa4all-client < 1.2.1 affected
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I. Basic Information for CVE-2026-44900

Vulnerability Information
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Vulnerability Title
epa4all-client: VAU Signature bypass
Source: CVE Program / CVE List V5
Vulnerability Description
epa4all-client is the Java Client for epa4all / ePA 3.0 in the Telematik Infrastruktur. Prior to 1.2.1, in SignedPublicKeysTrustValidatorImpl.isTrusted(), the ECDSA signature verification at line 45 discards the boolean return value of Signature.verify(). The method performs certificate chain validation, OCSP check, and signature algorithm setup, but never checks whether the signature actually matches. For any structurally valid signature, it returns true. This vulnerability is fixed in 1.2.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/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
epa4all-client 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
epa4all-client是Oviva AG开源的一个文档写入客户端工具。 epa4all-client 1.2.1之前版本存在信任管理问题漏洞，该漏洞源于SignedPublicKeysTrustValidatorImpl.isTrusted()中ECDSA签名验证丢弃Signature.verify()的布尔返回值，导致任何结构有效的签名均返回true。
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
oviva-ag epa4all-client < 1.2.1 -
com.oviva.telematik epa4all-client < 1.2.1 -

II. Public POCs for CVE-2026-44900

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10089 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-44900

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Patches & Fixes for CVE-2026-44900 (1)

Vendor Advisories for CVE-2026-44900 (1)

Same Patch Batch · oviva-ag · 2026-05-26 · 4 CVEs total

CVE-2026-45574 8.1 HIGH epa4all-client: TLS Certificate Validation Disabled in Production
CVE-2026-45575 7.4 HIGH epa4all-client: Improper Verification of Cryptographic Signature
CVE-2026-47672 6.5 MEDIUM epa4all-client: Unauthenticated REST API for Patient Record Writes

IV. Related Vulnerabilities

Same product: epa4all-client
Same vendor: oviva-ag
Same weakness: CWE-295

V. Comments for CVE-2026-44900

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