Update the WordPress Herd Effects plugin to the latest available version (at least 5.2.1).
0xB9 discovered and reported this Local File Inclusion vulnerability in WordPress Herd Effects Plugin. This could allow a malicious actor to include local files of the target website and show its output onto the screen. Files which store credentials, such as database credentials, could potentially allow complete database takeover. This vulnerability has been fixed in version 5.2.1.