Input validation vulnerability in WP Fastest Cache 0.8.5.7

The WP Fastest Cache plugin for WordPress is vulnerable to a security issue in versions up to, and including, 0.8.5.7. Attackers who have an account on the WordPress website can include and execute files which they would not normally have access to. This could let them bypass security controls, gain access to sensitive information, or even execute code in situations where they can upload and include images and other file types that are usually considered safe.