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CVE-2025-43921

Description

GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.

POC

Reference

- https://github.com/0NYX-MY7H/CVE-2025-43921

Github

- https://github.com/0NYX-MY7H/CVE-2025-43921

- https://github.com/ARPSyndicate/cve-scores

- https://github.com/nomi-sec/PoC-in-GitHub

- https://github.com/plzheheplztrying/cve_monitor