Pokémon Go Is Painfully Insecure: Revoke Its Access to Your Google Account
 

To say Pokémon GO is wildly popular would be a vast understatement. To say the app’s use of your Google Account is wildly insecure would also be a vast understatement. You should, despite how addicting the game is, probably stop playing and wait for a secure update.

http://www.howtogeek.com/262402/poke...oogle-account/