Security: Privilege Escalation via Phusion Passenger's Watchdog API

Incident Report for CloudLinux

Monitoring

The patched versions are already available in our stable repository.

Posted Aug 15, 2026 - 04:04 UTC

Phusion Passenger Watchdog API privilege escalation vulnerability:
https://support.cpanel.net/hc/en-us/articles/42694659893143-Security-Privilege-Escalation-via-Phusion-Passenger-s-Watchdog-API?utm_medium=email&_hsmi=433242580&utm_content=433242580&utm_source=hs_email

CloudLinux engineering is preparing and testing patched packages. Updated packages will be released shortly.

Posted Aug 14, 2026 - 13:53 UTC

This incident affects: CloudLinux OS Components (EasyApache4 PHP packages).