PHP has announced two critical security vulnerabilities, rated CVSS v4.0 9.2, with a release on 21 October 2026. Here is how to check your PHP version and patch cPanel and non-panel servers.
Install GNU MP (GMP) on your cPanel server for high-performance arithmetic and cryptographic applications.
This blog post has been updated! PHP 7 is now obsolete, and cPanel officially supports PHP 8.1, 8.2, and 8.3. At UnderHost, we use CloudLinux on our shared servers, allowing customers to select PHP versions from 5.6 up to 8.4. Learn more about supported versions and how to upgrade via EasyApache 4.
cURL comes in two parts. The curl command is part of the operating system: install or update it with dnf install curl and check it with curl --version. PHP's cURL extension, which WordPress, WHMCS and most payment plugins need, is installed per PHP version in WHM > EasyApache 4 (package ea-phpXX-php-curl). Check it with php -m | grep -i curl.
Missing VirtualHost directives in your Apache configuration? Learn how to restore them in cPanel by rebuilding httpd.conf.