Improper authorization in handler for custom URL scheme vulnerability in Retty App for Android versions prior to 4.8.13 and Retty App for iOS versions prior to 4.11.14 allows a remote attacker to lead a user to access an arbitrary website via the vulnerable App.
Retty App for Android versions prior to 4.8.13 and Retty App for iOS versions prior to 4.11.14 uses a hard-coded API key for an external service. By exploiting this vulnerability, API key for an external service may be obtained by analyzing data in the app.