Input validation vulnerability in Cornerstone 0.8.0

The plugin called Cornerstone, which is used on WordPress websites, has a security issue in all versions up to 0.8.0. This vulnerability is known as Reflected Cross-Site Scripting and it occurs because the plugin does not properly clean up any harmful code that is entered or displayed on the site. This means that attackers who are not logged in can insert malicious code into a page, which will run when a user clicks on a link.