The application uses a specific middleware to sanitize inputs, but it fails to account for nested objects or array-based parameter pollution.

In the "WEB18" series of this CTF, the challenge often involves or Python/Flask backend vulnerabilities.

Analyze the provided source code (often distributed in parts like .part4.rar ) to find a vulnerability that allows for Flag retrieval. 🔍 Investigation 1. File Context

If the key is "hardcoded" or "leaked," you can forge an admin session. Step 2: Path Traversal or SSRF