Source :- https://tutorialboy24.blogspot.com/2022/10/android-security-checklist-for.html
WebView is a web browser that can be built into an app, and represents the most widely used component of the Android ecosystem; it is also subject to the largest number of potential errors. If it is possible to load arbitrary URLs or to execute JavaScript code controlled by the attacker, we most often have to deal with the leaking of authentication tokens, the theft of arbitrary files, and access to arbitrary activities – which can even lead to remote code execution.
A Typical Example of the Vulnerability
The commonest version is the case where there are no checks or limitations on loading arbitrary URLs inside WebView. Let’s suppose we have a DeeplinkActivity that processes a URL such as myapp://deeplink.
File AndroidManifest.xml