Input validation vulnerability in wpForo Forum 2.1.8

The wpForo Forum plugin for WordPress contains a security vulnerability in certain versions. If a user clicks on a link that has been created by an unauthenticated attacker, it may allow the attacker to inject web scripts into the page. This could potentially lead to malicious activity. To prevent this, it is important to make sure that the wpForo Forum plugin is up to date, and that any links or information from untrusted sources are not clicked on.