cPanel compromise: CVE-2026-41940 and the Filemanager backdoor
A critical cPanel/WebHost Manager flaw tracked as CVE-2026-41940 is being actively exploited to deploy a cross-platform backdoor known as Filemanager. Security researchers tied the activity to a threat actor using the handle Mr_Rot13, and observed rapid, automated scanning and exploitation from thousands of attacker IPs worldwide. The attacks move quickly from an initial authentication bypass to persistent access via injected SSH keys, PHP web shells, credential theft, and eventual deployment…