Cross-site scripting (XSS) vulnerability in the subscription functionality in the Project issue tracking module before 4.7.x-1.5, 4.7.x-2.x before 4.7.x-2.5, and 5.x-1.x before 5.x-1.1 for Drupal allows remote authenticated users with project create or edit permissions to inject arbitrary web script or HTML via unspecified vectors involving a (1) individual or (2) overview form.