Mobile Security Framework (MobSF) is a pen-testing, malware analysis and security assessment framework capable of performing static and dynamic analysis. In version 3.9.5 Beta and prior, MobSF does not perform any input validation when extracting the hostnames in android:host, so requests can also be sent to local hostnames. This can lead to server-side request forgery. An attacker can cause the server to make a connection to internal-only services within the organizations infrastructure. Commit 5a8eeee73c5f504a6c3abdf2a139a13804efdb77 has a hotfix for this issue.
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.