The Fast Tube WordPress plugin through 2.3.1 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in NotFound Fast Tube allows Reflected XSS. This issue affects Fast Tube: from n/a through 2.3.1.