Hola, dejo textualmente el mensaje que me llego al correo.
Vulnerability Disclosure
WP Super Cache WordPress Plugin
This is a Public Service Announcement, it does not mean you are affected. It is being shared to help bring awareness to the vulnerability and help make the web a safer place by distributing important security advisories. If you do use this plugin or know someone that uses it, please help spread the word.
During a routine audit of our Website Firewall, our Vulnerability Research team found and disclosed a critical severity vulnerability in the WordPress WP MainWP-Child plugin. The vulnerability has been patched and if you are using the plugin we encourage you to update at your earliest convenience.
The security issue was patched in version 1.4.4, now available in the WordPress repository.
Saludos