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.
PoC: CVE-2025-43919-POC
A new vulnerability has been discovered in GNU Mailman 2.1.39, bundled with cPanel/WHM, allowing unauthenticated remote attackers to read arbitrary files on the server via a directory traversal flaw.
PoC: CVE-2025-43919
CVE-2025-43919: Directory Traversal Vulnerability in GNU Mailman 2.1.39
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
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