Input validation vulnerability in Media Library Categories 2.0.0

The Media Library Categories plugin for WordPress is vulnerable to a security problem. This security problem is called Stored Cross-Site Scripting, and it affects versions of the plugin up to and including 2.0.0. This security problem makes it possible for attackers with administrator-level access or higher to inject malicious web scripts into pages. Whenever a user visits an injected page, these malicious scripts can execute. This security problem only affects multi-site installations and installations where the feature called unfiltered_html has been disabled.