Input validation vulnerability in Knowledge Base 2.1.1

The Knowledge Base plugin for WordPress is vulnerable to a security issue called Stored Cross-Site Scripting. This means that when the plugin is used on a website, attackers with certain permissions can inject malicious code into pages that will be run when other users visit the page. Versions of the plugin up to and including 2.1.1 are vulnerable to this issue due to inadequate input checks and output protection.