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CVE-2026-45575— epa4all-client: Improper Verification of Cryptographic Signature

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 1.2.2之前版本存在数据伪造问题漏洞，该漏洞源于中间人攻击者可替换伪造的发现文档，将加密密钥重定向至攻击者控制的URL，可能导致捕获签名认证材料。

CVSS 7.4 · High EPSS 0.12% · P2

Affected Version Matrix 2

VendorProduct Version RangeStatus
com.oviva.telematik epa4all-client < 1.2.2 affected
oviva-ag epa4all-client < 1.2.2 affected
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I. Basic Information for CVE-2026-45575

Vulnerability Information
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Vulnerability Title
epa4all-client: Improper Verification of Cryptographic Signature
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 1.2.2, an attacker who can MITM the TLS connection between the client and the IDP (within the TI network) can substitute a forged discovery document. The forged document redirects uri_puk_idp_enc and uri_puk_idp_sig to attacker-controlled URLs. The client then encrypts the SMC-B-signed challenge response to the attacker's encryption key and POSTs it to the attacker's auth endpoint. This captures the signed authentication material. This vulnerability is fixed in 1.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
epa4all-client 数据伪造问题漏洞
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 1.2.2之前版本存在数据伪造问题漏洞，该漏洞源于中间人攻击者可替换伪造的发现文档，将加密密钥重定向至攻击者控制的URL，可能导致捕获签名认证材料。
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 < 1.2.2 -
com.oviva.telematik epa4all-client < 1.2.2 -

II. Public POCs for CVE-2026-45575

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10278 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-45575

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Patches & Fixes for CVE-2026-45575 (1)

Vendor Advisories for CVE-2026-45575 (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-2026-44900 8.1 HIGH epa4all-client: VAU Signature bypass
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-347

V. Comments for CVE-2026-45575

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