CVE-2026-21859

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.

• CWE-918

• https://github.com/axllent/mailpit/commit/3b9b470c093b3d20b7d751722c1c24f3eed2e19dPatch
• https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfrExploit, Vendor Advisory
• https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfrExploit, Vendor Advisory

Published

Jan 8, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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