WP 404 Auto Redirect to Similar Post <= 1.0.4 - Reflected Cross-Site Scripting via Debug Mode URI

The WP 404 Auto Redirect to Similar Post plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the URI in all versions up to, and including, 1.0.4 due to insufficient input sanitization and output escaping. 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. Successful exploitation requires "Debug Mode" to be enabled in the plugin's settings.