Summary
Mailpit versions 1.28.0 and earlier are vulnerable to a Server-Side Request Forgery (SSRF) flaw (CVE-2026-21859) that allows attackers to probe internal networks and access sensitive cloud metadata. CrowdSec reports active, intelligence-driven exploitation attempts targeting the /proxy endpoint.
Take Action:
Ensure development tools like Mailpit are never exposed to the public internet without strict authentication and network segmentation. If you are using Mailpit make sure it's isolated and update ASAP to version 1.28.1. These tools are already attacked and attacks will only get worse.
Read the full article on BeyondMachines
This article was originally published on BeyondMachines
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