Image credits to Leobit This is a walkthrough of an exercise created by PentesterLab as a free course for learning beginner-friendly source code review. The link to the source code is here . Either clone it or download it as a zip locally. As instructed in the exercise we won't run the run, just read through the source code and look for possible weaknesses that we can leverage into vulnerabilities. LIST OF WEAKNESSES You can find below the list of issues present in the application: Hardcoded credentials or secrets Information leak Missing security flags Weak password hashing mechanism Cross-Site Scripting No CSRF protection Directory Listing Crypto issue Signature bypass Authentication bypass Authorization bypass Remote Code Execution Hand-On Findings and Objectives * Hardcoded credentials or secrets Finding hardcoded credentials