The Restaurant Menu – Food Ordering System – Table Reservation plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'action' parameter in all versions up to, and including, 2.4.2 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.
The Restaurant Menu WordPress plugin before 2.3.6 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks