CVE-2021-20835

Improper authorization in handler for custom URL scheme vulnerability in Android App ‘Mercari (Merpay) – Marketplace and Mobile Payments App’ (Japan version) versions prior to 4.49.1 allows a remote attacker to lead a user to access an arbitrary website and the website launches an arbitrary Activity of the app via the vulnerable App, which may result in Mercari account’s access token being obtained.

Source: CVE-2021-20835