The growing use of mobile devices has caused many developers to focus more on design and user experience, but with this neglected security issues, whether due to lack of knowledge in this field or lack of delivery time, thus exposing thousands of users to information leaks among other malicious actions. In this sense, this work aims to expose the main vulnerabilities that impact the security of a mobile application, going through analyzes in mobile applications, with the intention of alerting developers about the flaws that are usually present in the applications due to bad coding practices and to reflect on how to make your apps more secure.