Description

The Mobile Options settings does not sanitise and escape the $mb_options['fcm_key'] parameter lead to stored XSS

Proof of Concept

Go to Mobile settings, fill XSS payload into FCM Key field kind of: somekey"><img/src/onerror=alert('xss')>

Impact

XSS can have huge implications for a web application and its users. User accounts can be hijacked, change the html screen and insult the organization. Credentials could be stolen, sensitive data could be exfiltrated, and lastly, access to your client computers can be obtained.