In FusionPBX up to v4.5.7, the file resources\download.php uses an unsanitized "f" variable coming from the URL, which takes any pathname and allows a download of it. (resources\secure_download.php is also affected.)
https://resp3ctblog.wordpress.com/2019/10/19/fusionpbx-path-traversal-2/
https://github.com/fusionpbx/fusionpbx/commit/9c61191049c949e01f99ea1fbab1feb44709e108
https://github.com/fusionpbx/fusionpbx/commit/9482d9ee0e4287df21339be4276125e38e048951