FKIE_CVE-2026-23845

Vulnerability from fkie_nvd - Published: 2026-01-19 19:16 - Updated: 2026-02-05 18:35
Severity ?
5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/axllent/mailpit/commit/1679a0aba592ebc8487a996d37fea8318c984dfePatch
security-advisories@github.comhttps://github.com/axllent/mailpit/releases/tag/v1.28.3Product, Release Notes
security-advisories@github.comhttps://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5jExploit, Vendor Advisory
Impacted products
Vendor Product Version
axllent mailpit *
To clipboard 

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      "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 `\u003clink rel=\"stylesheet\" href=\"...\"\u003e` tags to inline them for testing. Version 1.28.3 fixes the issue."
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  "id": "CVE-2026-23845",
  "lastModified": "2026-02-05T18:35:31.477",
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          "confidentialityImpact": "LOW",
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          "privilegesRequired": "NONE",
          "scope": "CHANGED",
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          "confidentialityImpact": "HIGH",
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          "userInteraction": "NONE",
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          "lang": "en",
          "value": "CWE-918"
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      "type": "Primary"
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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