EXECUTIVE SUMMARY:
CVE-2026-54420 with a CVSS score of 8.5 is a privilege escalation vulnerability in the LiteSpeed cPanel plugin, specifically affecting versions prior to 2.4.8, which allows an attacker to exploit a symlink following vulnerability to gain elevated privileges. This vulnerability can be exploited by a low-privileged user with FTP or web shell access on a shared hosting server running CloudLinux/CageFS, who can create a malicious symlink to escape their restricted environment and gain full root access to the server. An attacker can exploit this vulnerability by creating a symlink that points to a sensitive file or directory, allowing them to access and manipulate sensitive data, and ultimately gain control of the entire server. If successfully exploited, this vulnerability can have severe business consequences, including compromise of all hosted sites on a shared server, as a single compromised user can put all other users at risk. The exploitation of this vulnerability requires the attacker to have limited access to the server, such as FTP or web shell access, and for the server to be running CloudLinux/CageFS, making it a significant threat to hosting providers with shared servers.[/subscribe_to_unlock_form]
EXECUTIVE SUMMARY:
CVE-2026-54420 with a CVSS score of 8.5 is a privilege escalation vulnerability in the LiteSpeed cPanel plugin, specifically affecting versions prior to 2.4.8, which allows an attacker to exploit a symlink following vulnerability to gain elevated privileges. This vulnerability can be exploited by a low-privileged user with FTP or web shell access on a shared hosting server running CloudLinux/CageFS, who can create a malicious symlink to escape their restricted environment and gain full root access to the server. An attacker can exploit this vulnerability by creating a symlink that points to a sensitive file or directory, allowing them to access and manipulate sensitive data, and ultimately gain control of the entire server. If successfully exploited, this vulnerability can have severe business consequences, including compromise of all hosted sites on a shared server, as a single compromised user can put all other users at risk. The exploitation of this vulnerability requires the attacker to have limited access to the server, such as FTP or web shell access, and for the server to be running CloudLinux/CageFS, making it a significant threat to hosting providers with shared servers.[emaillocker id="1283"]
RECOMMENDATION:
We recommend you to update LiteSpeed cPanel plugin to version 2.4.8 and WHM Plugin to version 5.3.2.1.
REFERENCES:
The following reports contain further technical details:
https://securityonline.info/litespeed-cpanel-privilege-escalation-cve-2026-54420/