This vulnerability stems from three design flaws in an Android app: lack of URL validation for deep links, unconditional appending of authentication tokens to all URLs loaded in a WebView, and transmitting sensitive tokens as query parameters instead of secure headers. When a user clicks on a maliciously crafted link directing them to an attacker-controlled domain via the app's deep linking feature, their authentication token is leaked due to these flaws. The token can then be intercepted by attackers, allowing unauthorized access to the victim’s account. This chain of failures highlights critical security practices such as validating input URLs and securely transmitting sensitive data.
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