In FusionPBX up to v4.5.7, the file app\access_controls\access_control_nodes.php uses an unsanitized "id" variable coming from the URL, which is reflected in HTML, leading to XSS.
https://resp3ctblog.wordpress.com/2019/10/19/fusionpbx-xss-14/
https://github.com/fusionpbx/fusionpbx/commit/c9f87dc16def2135930ebbfd667651cc3f6de2ff