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.

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.

The StageShow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘anchor’ parameter in all versions up to, and including, 10.0.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.