Input validation vulnerability in Clasify Classified Listing 1.0.7

The Clasify Classified Listing plugin for WordPress has a security issue called Reflected Cross-Site Scripting. This can affect all versions up to and including 1.0.7. The problem is caused by not properly cleaning up the input and output of the plugin. This means that attackers who are not logged in can insert harmful web scripts into pages that will run if a user clicks on a deceptive link.