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

CVSS 7.4 · High
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
密码学签名的验证不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
oviva-agepa4all-client < 1.2.2 -
com.oviva.telematikepa4all-client < 1.2.2 -

II. Public POCs for CVE-2026-45575

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 10278 chars
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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-2026-455748.1 HIGHepa4all-client: TLS Certificate Validation Disabled in Production
CVE-2026-449008.1 HIGHepa4all-client: VAU Signature bypass
CVE-2026-476726.5 MEDIUMepa4all-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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