Upstream information

CVE-2026-21859 at MITRE

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.

SUSE information

Overall state of this security issue: Does not affect SUSE products

No SUSE Bugzilla entries cross referenced.

No SUSE Security Announcements cross referenced.

List of released packages

Product(s) Fixed package version(s) References

SUSE Timeline for this CVE

CVE page created: Thu Jan 8 02:03:08 2026
CVE page last modified: Fri May 8 11:56:42 2026