https://pankajupadhyay.in/2019/06/24/webex-meetings-are-vulnerable-to-mitm/

"In my free time, I was looking at some Android applications and noticed
that I was able to intercept SSL traffic for Webex Meetings app. When
explored it further, I found that Webex Meetings mobile app accepts
self-signed certificates. Also there is no certificate pinning enabled.

This makes Webex meet app vulnerable to Man in the middle attack.

Users of this app, if connected to a public Wi-Fi spot, can be targeted by
any person in the same network. If connected to a rogue Wi-Fi hotspot,
Wi-Fi provider may have access to the data passed from the app to the
server. Malwares on the device can also exploit this vulnerability to
intercept any sensitive data while it’s traveling across the wire."