The StageShow plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of remove_query_arg without appropriate escaping on the URL in all versions up to, and including, 9.8.6. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Open redirect vulnerability in the Redirect function in stageshow_redirect.php in the StageShow plugin before 5.0.9 for WordPress allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in the url parameter.