Security researcher Daniel E. Wood discovered a vulnerability in the Starbucks official iOS app related to the insecure storage of user data. 10 million Starbucks customers who purchases drinks and food using their Smartphones are exposed to serious risk of data breach. Starbucks has promptly managed the incident, issuing an official statement to inform the clients and a successily providing an advisory to publicize the availability for an app update. The recommendation for who made purchases is to change it immediately and adopting a different username and password for every service.”]
Source: https://securityaffairs.co/wordpress/21328/hacking/starbucks-ios-app-flaw.html