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CVE PROGRAM SOURCE RECORD5.8 Medium

CVE-2026-21859

Mailpit Proxy Endpoint is Vulnerable to Server-Side Request Forgery (SSRF)

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

axllent mailpit

  • < 1.28.1affected

References