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CVE-2026-21859

Estado: AnalizadaMedia (5.3)—

Mailpit is an email testing tool and API for developers. Versions 1.28.0 and below have a Server-Side Request Forgery (SSRF) vulnerability in the /proxy endpoint, allowing attackers to make requests to internal network resources. The /proxy endpoint validates http:// and https:// schemes, but it does not block internal IP addresses, enabling attackers to access internal services and APIs. This vulnerability is limited to HTTP GET requests with minimal headers. The issue is fixed in version 1.28.1.

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).

Tecnologías afectadas (1)

Axllent — Mailpit

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-21859",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21859",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-08T19:23:19.174824Z"
        }
      }
    ],
    "cvssMetricV31": [
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          "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
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
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  "published": "2026-01-08T00:16:00.150",
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      "url": "https://github.com/axllent/mailpit/commit/3b9b470c093b3d20b7d751722c1c24f3eed2e19d",
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      "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr",
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "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 1.28.0 and below have a Server-Side Request Forgery (SSRF) vulnerability in the /proxy endpoint, allowing attackers to make requests to internal network resources. The /proxy endpoint validates http:// and https:// schemes, but it does not block internal IP addresses, enabling attackers to access internal services and APIs. This vulnerability is limited to HTTP GET requests with minimal headers. The issue is fixed in version 1.28.1."
    },
    {
      "lang": "es",
      "value": "Mailpit es una herramienta de prueba de correo electrónico y una API para desarrolladores. Las versiones 1.28.0 e inferiores tienen una vulnerabilidad de falsificación de petición del lado del servidor (SSRF) en el endpoint /proxy, permitiendo a los atacantes realizar peticiones a recursos de la red interna. El endpoint /proxy valida los esquemas http:// y https://, pero no bloquea las direcciones IP internas, lo que permite a los atacantes acceder a servicios y API internas. Esta vulnerabilidad está limitada a peticiones HTTP GET con encabezados mínimos. El problema está solucionado en la versión 1.28.1."
    }
  ],
  "lastModified": "2026-06-17T10:19:02.623",
  "configurations": [
    {
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        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:axllent:mailpit:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AEB660CD-DB82-43AE-A1A8-7A4724C1967F",
              "versionEndExcluding": "1.28.1"
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          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}