FKIE_CVE-2026-21859

Vulnerability from fkie_nvd - Published: 2026-01-08 00:16 - Updated: 2026-02-02 19:16
Severity ?
5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/axllent/mailpit/commit/3b9b470c093b3d20b7d751722c1c24f3eed2e19dPatch
security-advisories@github.comhttps://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfrExploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfrExploit, Vendor Advisory
Impacted products
Vendor Product Version
axllent mailpit *
To clipboard 

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  "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."
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      "lang": "es",
      "value": "Mailpit es una herramienta de prueba de correo electr\u00f3nico y una API para desarrolladores. Las versiones 1.28.0 e inferiores tienen una vulnerabilidad de falsificaci\u00f3n de petici\u00f3n 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 est\u00e1 limitada a peticiones HTTP GET con encabezados m\u00ednimos. El problema est\u00e1 solucionado en la versi\u00f3n 1.28.1."
    }
  ],
  "id": "CVE-2026-21859",
  "lastModified": "2026-02-02T19:16:52.987",
  "metrics": {
    "cvssMetricV31": [
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
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          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
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          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
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          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
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          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
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        "source": "nvd@nist.gov",
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  "published": "2026-01-08T00:16:00.150",
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          "value": "CWE-918"
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      "type": "Secondary"
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  ]
}


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