An issue was discovered in FusionPBX up to 4.5.7. In the file app\conference_controls\conference_control_details.php, an unsanitized id variable coming from the URL is reflected in HTML on 2 occasions, leading to XSS.
https://resp3ctblog.wordpress.com/2019/10/19/fusionpbx-xss-1/
https://github.com/fusionpbx/fusionpbx/commit/02378c54722d89f875c66ddb00ff06468dabbc6d