Running PHP 5.4.16 in a production environment is extremely dangerous. Attackers can leverage public GitHub PoCs to gain root access to your server. It is highly recommended to upgrade to at least PHP 8.x to benefit from modern memory protections and security patches. PHP CGI Argument Injection - Rapid7 Vulnerability Database
: Because it is a "Stored" XSS, the payload is saved in the site's database as part of the page content. php 5416 exploit github
For broader PHP core security, developers should monitor the official php-src security advisories on GitHub for updates regarding the engine itself. Running PHP 5