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Complete Authentication and Logic Bypasses, or equivalent HTTP and Linux fundamentals, before this module. In this module of the Web CTF learning path, you move from authentication logic bypasses into input handling and parser attacks. You read a local file straight off disk through an unguarded include sink, study a reflected output pattern that looks like classic Cross-Site Scripting and prove for yourself whether the running application actually reflects it, and build XML payloads that abuse a parser configured to resolve external entities. Legacy PHP running on an older Debian base backs every challenge in this lab. Treat that runtime as compatibility debt, not as a modern framework default, and note where a current stack would already close these gaps. Upon completion of the module, students will be able to: • Identify and exploit Local File Inclusion through an unguarded include parameter. • Distinguish a vulnerable looking source pattern from proven, observable Cross-Site Scripting impact. • Craft payloads that satisfy an application's incomplete validation gate without overstating what was actually exploited. • Build XML External Entity payloads that abuse libxml entity substitution to read local files. • Explain why parser configuration, not just input filtering, decides whether an XML endpoint is safe. For inquiries, please write us at https://www.darkrelay.com/cybersecurity-course-inquiry