"More than 75 Percent of Mobile Applications Will Fail Basic Security Tests through 2015"
Android is the prime mobile target for cyber criminals:
87% of mobile devices are Android (Forbes), but Android has some disadvantages. Android apps are easy to reverse engineer. There are a lot of hacking tools available that are free and easy to use and let anyone reverse engineer or even 'trojanize' an Android app. Android is responsible for 92% of all known mobile malware.
Possible vulnerabilities for unprotected apps:
Insertion of malware (key logging, password snooping, connection tampering), theft of data & intellectual property, swapping advertisements, changing brands, bypassing authentication logic, piracy and last but not least loss of credibility.