Vulnerability-Lookup

CVE-2026-45575 (GCVE-0-2026-45575)

Vulnerability from cvelistv5 – Published: 2026-05-26 21:01 – Updated: 2026-05-28 14:11

Title

epa4all-client: Improper Verification of Cryptographic Signature

Summary

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.

Severity

7.4 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-28 14:11 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/oviva-ag/epa4all-client/securi…	x_refsource_CONFIRM
https://github.com/oviva-ag/epa4all-client/pull/36	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
oviva-ag	epa4all-client	Affected: < 1.2.2	guessed
com.oviva.telematik	epa4all-client	Affected: < 1.2.2	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-45575

Vulnerability from fkie_nvd - Published: 2026-05-26 21:16 - Updated: 2026-07-24 11:10

Severity

7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/oviva-ag/epa4all-client/pull/36
	security-advisories@github.com	https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "epa4all-client",
          "vendor": "oviva-ag",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.2.2"
            }
          ]
        },
        {
          "product": "epa4all-client",
          "vendor": "com.oviva.telematik",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.2.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s encryption key and POSTs it to the attacker\u0027s auth endpoint. This captures the signed authentication material. This vulnerability is fixed in 1.2.2."
    },
    {
      "lang": "es",
      "value": "epa4all-client es el Cliente Java para epa4all / ePA 3.0 en la Telematik Infrastruktur. Anterior a la 1.2.2, un atacante que puede realizar un MitM a la conexi\u00f3n TLS entre el cliente y el IDP (dentro de la red TI) puede sustituir un documento de descubrimiento falsificado. El documento falsificado redirige uri_puk_idp_enc y uri_puk_idp_sig a URLs controladas por el atacante. El cliente entonces cifra la respuesta al desaf\u00edo firmada con SMC-B con la clave de cifrado del atacante y la env\u00eda mediante POST al endpoint de autenticaci\u00f3n del atacante. Esto captura el material de autenticaci\u00f3n firmado. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 1.2.2."
    }
  ],
  "id": "CVE-2026-45575",
  "lastModified": "2026-07-24T11:10:00.170",
  "metrics": {
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      {
        "cvssData": {
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          "attackVector": "NETWORK",
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          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
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        "type": "Secondary"
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GHSA-GQX7-6552-67HF

Vulnerability from github – Published: 2026-05-15 18:30 – Updated: 2026-06-08 23:31

Summary

Improper Verification of Cryptographic Signature in com.oviva.telematik:epa4all-client

Details

Impact

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 u ri_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.

Patches

#36

Workarounds

None.

Resources

MS-OVIVA-EPA4ALL-d453c1

Credits

Machine Spirits (contact@machinespirits.de)

Dr. rer. nat. Simon Weber
Dipl.-Inf. Volker Schönefeld
Chiara Fliegner

Severity

7.4 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.oviva.telematik:epa4all-client"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45575"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-15T18:30:48Z",
    "nvd_published_at": "2026-05-26T21:16:40Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nAn 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 u ri_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\u0027s encryption key and POSTs it to the attacker\u0027s auth endpoint. This captures the signed authentication material.\n\n### Patches\n[#36](https://github.com/oviva-ag/epa4all-client/pull/36)\n\n### Workarounds\nNone.\n\n### Resources\n- MS-OVIVA-EPA4ALL-d453c1\n\n### Credits\n[Machine Spirits](https://machinespirits.com/) ([contact@machinespirits.de](mailto:contact@machinespirits.de))\n\n- Dr. rer. nat. Simon Weber\n- Dipl.-Inf. Volker Sch\u00f6nefeld\n- Chiara Fliegner",
  "id": "GHSA-gqx7-6552-67hf",
  "modified": "2026-06-08T23:31:26Z",
  "published": "2026-05-15T18:30:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45575"
    },
    {
      "type": "WEB",
      "url": "https://github.com/oviva-ag/epa4all-client/pull/36"
    },
    {
      "type": "WEB",
      "url": "https://github.com/oviva-ag/epa4all-client/commit/9111d6fbb939007036a7f74b2a93bb278cb5af32"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/oviva-ag/epa4all-client"
    },
    {
      "type": "WEB",
      "url": "https://github.com/oviva-ag/epa4all-client/releases/tag/v1.2.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Improper Verification of Cryptographic Signature in com.oviva.telematik:epa4all-client"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-45575 (GCVE-0-2026-45575)

FKIE_CVE-2026-45575

GHSA-GQX7-6552-67HF

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Related by attack behaviour