The application uses a specific middleware to sanitize inputs, but it fails to account for nested objects or array-based parameter pollution.
Multi-part RAR files usually contain the source code of the web application. Part 4 typically includes: BKPF23WEB18.part4.rar
If the key is "hardcoded" or "leaked," you can forge an admin session. Step 2: Path Traversal or SSRF The application uses a specific middleware to sanitize