CVE-2026-21859 describes a Server-Side Request Forgery (SSRF) vulnerability in Mailpit versions 1.28.0 and below, an email testing tool. Attackers can exploit the /proxy endpoint to make HTTP GET requests to internal network resources, bypassing scheme validation for internal IP addresses. This vulnerability has a CVSS score of 5.3 (Medium), indicating low attack complexity and no user interaction, but only allows for limited information disclosure. While there are no known active exploits or Metasploit modules, Nuclei templates exist, and the vulnerability has garnered some community discussion, suggesting potential for future exploitation.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.28.1CPE matchmatch criteria | cpe:2.3:a:axllent:mailpit:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.