The Drupal Bibliography Module 6.x-1.6 (http://drupal.org/project/biblio) contains a cross site scripting vulnerability because it fails to sanitize the output of the title field of the Biblio item. You can exploit this vulnerability by creatign a new piece of Biblio content and entering JavaScript in the title field. Once created the JavaScript will execute any time anyone views the biblio item. This means that someone who has the ability to create content can expose other users to XSS even if they're restricted with respect to the input types they're using. XSS can lead to a compromise of the Drupal root user, which then allows attackers to take control of the web server.