In the 3CX Phone System 15.5.3554.1, the Management Console typically listens to port 5001 and is prone to a directory traversal attack: "/api/RecordingList/DownloadRecord?file=" and "/api/SupportInfo?file=" are the vulnerable parameters. An attacker must be authenticated to exploit this issue to access sensitive information to aid in subsequent attacks.

On 3CX 15.5.6354.2 devices, the parameter "file" in the request "/api/RecordingList/download?file=" allows full access to files on the server via path traversal.