Description
GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to read arbitrary files via ../ directory traversal at /mailman/private/mailman (aka the private archive authentication endpoint) via the username parameter. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.
Problem types
CWE-24 Path Traversal: '../filedir'
Product status
2.1.39 (custom)
References
code.launchpad.net/~mailman-coders/mailman/2.1
github.com/0NYX-MY7H/CVE-2025-43919
github.com/cpanel/mailman2-python3
www.openwall.com/lists/oss-security/2025/04/21/6