Critical ConfigServer Security & Firewall Flaw Lets Remote Attackers Execute Arbitrary Commands
Brief
A critical vulnerability in ConfigServer Security & Firewall (CSF) could allow unauthenticated remote attackers to execute arbitrary commands on vulnerable servers. Tracked as CVE-2026-65638, the flaw affects CSF versions 14. 00 through 16. 29 and has been resolved in version 16. 30 and later.
The issue was identified in the MESSENGER service of ConfigServer Security & Firewall, a widely deployed firewall-management solution used on Linux hosting servers and cPanel & WHM environments.
The vulnerable component could allow a remote attacker to execute commands as the CSF service account without requiring authentication.
Critical ConfigServer Security & Firewall Flaw
Although successful exploitation does not immediately grant root-level access, the vulnerability creates a serious remote code execution risk.