Contact Form by Supsystic < 1.7.29 - Authenticated (Admin+) Remote Code Execution

Description

The Contact Form by Supsystic plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.7.28. This is due to the functionality being vulnerable to server-side template injection (SSTI). This makes it possible for authenticated attackers, with administrator-level access and above, to execute code on the server.