The Starbucks 2.6.1 application for iOS stores sensitive information in plaintext in the Crashlytics log file (/Library/Caches/com.crashlytics.data/com.starbucks.mystarbucks/session.clslog), which allows attackers to discover usernames, passwords, and e-mail addresses via an application that reads session.clslog.
https://itunes.apple.com/us/app/starbucks/id331177714?mt=8
https://exchange.xforce.ibmcloud.com/vulnerabilities/90412
http://www.zdnet.com/the-starbucks-bug-not-as-awful-as-reported-7000025269/
http://www.zdnet.com/starbucks-fixes-ios-app-bugs-7000025323/
http://www.securityfocus.com/bid/64942
http://www.securityfocus.com/archive/1/530756/100/0/threaded