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Prerequisite: Complete [APIs and Business Logic Abuse](https://www.darkrelay.com/challenge-page/apis-and-business-logic-abuse) before this module. That unit covers REST mass assignment, JWT forgery, and treasury race conditions on NeonVault APIs. You will reuse the same HTTP request craft and impact-proving habits here when you turn portal bugs into interactive host compromise. In this module of the Web Application Pentester learning path, you take single-vulnerability skills from earlier modules and turn them into interactive host compromise on a web server. Advanced Web Vulnerabilities already proved worker-side code execution through pickle deserialization on a background queue. Here the target is different: the NeonVault Legacy Portal (PHP/Apache), where you need a foothold you can drive from Kali, including reverse shells and multi-bug chains. Finding a bug is only half the job; the value of an assessment is proving impact on the host that serves the application. You will upload a web shell through a form that trusts any file, gain an interactive reverse shell through OS command injection in a network diagnostics tool, and finally chain two lower-severity bugs, an upload filter that only blocks known-bad extensions and a Local File Inclusion, into remote code execution. Chaining is the skill that separates a scanner finding from a real breach, and it is the bridge into advanced research work. Upon completion of the module, students will be able to: - Exploit an unrestricted file upload to plant a web shell and run commands on the server. - Exploit OS command injection to run commands inline and to catch an interactive reverse shell. - Chain an upload filter bypass with a Local File Inclusion to achieve remote code execution. For inquiries, please write us at https://www.darkrelay.com/cybersecurity-course-inquiry