Input validation vulnerability in I Recommend This 3.8.3

The I Recommend This plugin for WordPress has a security vulnerability in versions up to, and including, 3.8.3. This vulnerability can be exploited by people with administrator-level permissions and above. It makes it possible for them to inject web scripts into pages which will be executed when someone visits those pages. This vulnerability only affects multi-site installations and installations where the unfiltered_html option has been disabled.