If you are familiar at all with WordPress, you know that web security is a huge priority for the WordPress team. As a benefit of using WordPress as a web content management system, security vulnerabilities will be patched on your site automatically.
Cross Site Scripting is a common website vulnerability that effects web forms, search boxes and any place a user can submit content to a website database.
If you are using WordPress already, you are in good shape. However, you could still be vulnerable to this kind of attack if your site makes use of plugins for any of its features. This makes it critical to have regular updates and maintenance to the WordPress framework and site plugins to ensure compatibility and security.