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CVE-2026-29143

Estado: AnalizadaAlta (7.8)—

SEPPmail Secure Email Gateway before version 15.0.3 does not properly authenticate the inner message of S/MIME-encrypted MIME entities, allowing an attacker to control trusted headers.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:N, PR:N, UI:N → explotación remota sin privilegios ni interacción (T1190). VI:L indica alteración de integridad; la falta de autenticación en mensajes S/MIME permite manipular encabezados de confianza (T1565.002: modificación de datos). SI:H sugiere suplantación via headers falsificados para phis

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningUser TrainingPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network Traffic

Tecnologías afectadas (1)

Seppmail — Secure Email Gateway

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-29143",
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          "options": [
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              "exploitation": "none"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-04-02T13:34:22.865322Z"
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        "cvssData": {
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          "modifiedSubIntegrityImpact": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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      "affectedData": [
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          "product": "Secure Email Gateway",
          "versions": [
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  "published": "2026-04-02T09:16:23.123",
  "references": [
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      "url": "https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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    {
      "lang": "en",
      "value": "SEPPmail Secure Email Gateway before version 15.0.3 does not properly authenticate the inner message of S/MIME-encrypted MIME entities, allowing an attacker to control trusted headers."
    }
  ],
  "lastModified": "2026-06-17T10:29:41.783",
  "configurations": [
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