Likely 0-day
A 3CX Phone System installer or setup wizard page is publicly accessible. This web-based configuration tool is used for initial PBX setup including admin credential creation, SIP trunk configuration, license activation, and network settings. Exposure of this page allows unauthenticated attackers to reconfigure or take over the phone system.
id: 3cx-installer
info:
name: 3CX Phone System - Installer Page Exposure
author: DhiyaneshDk
...