A cross-site scripting (XSS) vulnerability in app/fax/fax_files.php in FusionPBX 4.4.1 allows remote attackers to inject arbitrary web script or HTML via the id parameter.
https://github.com/fusionpbx/fusionpbx/commit/72a5ce4d2d6bc0ec0e72bbfb76487e4761f292c5