In this laboratory, we will carry out a safety audit of an Open Source web application. The technical objective is to provide a complete report and treat all phases of investigative work: black box analysis, open source analysis, identifying vulnerabilities (XSS, injections, disclosure, etc.), recommendations for strengthening, and prioritization of tasks. All skills will be tested in this complex exercise. We will work on a real application: (The name of the application will come later). The laboratory will end with the handing over of the report to the authors of the application so they can have an outside view on the safety of the application.