resources/cmd.php in FusionPBX up to 4.5.7 suffers from a command injection vulnerability due to a lack of input validation, which allows authenticated administrative attackers to execute any commands on the host as www-data.
https://resp3ctblog.wordpress.com/2019/10/19/fusionpbx-sofia-api-command-injection-2/
https://github.com/fusionpbx/fusionpbx/commit/6baad9af1bc55c80b793af3bd1ac35b39c20b173