CVE-2026-67402: Configserver Security & Firewall

Critical severity, CVSS 9.2. EPSS: 0.5% chance of exploitation in the next 30 days.

An insecure Apache configuration in ConfigServer Security & Firewall maps /usr/bin as CGI programs through the Messenger v3 HTTPS virtual host. A remote unauthenticated attacker whose address is blocked can request a mapped executable and run arbitrary commands as the Apache user. The vulnerability affects installations where CSF Messenger v3 and its HTTPS mode are enabled. WebPros addressed the vulnerability in version 16.31.

Affected products

• Configserver Configserver Security & Firewall: from 14.02
• WebPros Configserver Security & Firewall: from 14.02, before 16.31 (fixed in 16.31)

Published 2026-09-04. Last modified 2026-09-09.