Cross-site scripting (XSS) vulnerability in the administration user interface in the Classified Ads module before 6.x-3.1 and 7.x-3.x before 7.x-3.1 for Drupal allows remote authenticated users with the "administer taxonomy" permission to inject arbitrary web script or HTML via a category name.
https://www.drupal.org/node/2411527
https://www.drupal.org/node/2407785
https://www.drupal.org/node/2407783