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CVE-2026-23845

Estado: AnalizadaAlta (7.5)—

Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel="stylesheet" href="...">` tags to inline them for testing. Version 1.28.3 fixes the issue.

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.

SSRF en endpoint API expuesto sin autenticación (PR:N, UI:N) permite al atacante hacer solicitudes a servidores internos y potencialmente exfiltrar datos. CWE-918 confirma SSRF; C:H indica acceso a información.

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

Filter Network TrafficVulnerability ScanningSSL/TLS InspectionPrivileged Account ManagementNetwork SegmentationNetwork Intrusion Prevention

Tecnologías afectadas (1)

Axllent — Mailpit

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-23845",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-23845",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-20T20:04:04.082622Z"
        }
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    "cvssMetricV31": [
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      },
      {
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        "source": "nvd@nist.gov",
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
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          "availabilityImpact": "NONE",
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  "published": "2026-01-19T19:16:04.820",
  "references": [
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      "url": "https://github.com/axllent/mailpit/commit/1679a0aba592ebc8487a996d37fea8318c984dfe",
      "tags": [
        "Patch"
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        "Product",
        "Release Notes"
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    {
      "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5j",
      "tags": [
        "Exploit",
        "Vendor Advisory"
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      "source": "security-advisories@github.com"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel=\"stylesheet\" href=\"...\">` tags to inline them for testing. Version 1.28.3 fixes the issue."
    },
    {
      "lang": "es",
      "value": "Mailpit es una herramienta de prueba de correo electrónico y API para desarrolladores. Las versiones anteriores a la 1.28.3 son vulnerables a la falsificación de petición del lado del servidor (SSRF) a través de la descarga de CSS de la función HTML Check. La función HTML Check ('/api/v1/message/{ID}/html-check') está diseñada para analizar correos electrónicos HTML para compatibilidad. Durante este proceso, la función 'inlineRemoteCSS()' descarga automáticamente archivos CSS de etiquetas externas ' para incrustarlos para pruebas. La versión 1.28.3 corrige el problema."
    }
  ],
  "lastModified": "2026-06-17T10:22:11.673",
  "configurations": [
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          "negate": false,
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  "sourceIdentifier": "security-advisories@github.com"
}