In FusionPBX up to v4.5.7, the file app\conference_profiles\conference_profile_params.php uses an unsanitized "id" variable coming from the URL, which is reflected on 2 occasions in HTML, leading to XSS.
https://resp3ctblog.wordpress.com/2019/10/19/fusionpbx-xss-13/
https://github.com/fusionpbx/fusionpbx/commit/021ff8f8e51cd1254d19e88e7aedc4b795067f8d