Understanding the Mailpit SSRF Vulnerability In January 2026, a serious vulnerability was discovered in Mailpit, an email testing tool for developers. The issue, labeled CVE-2026-21859, involves a Server-Side Request Forgery (SSRF) in the /proxy endpoint. Mailpit versions 1.28.0 and earlier allow unauthorized access to internal network resources, which can be exploited by attackers. Why This […]













