https://app.hackthebox.com/challenges/491

Description

Intergalactic Ministry of Spies tested Pandora’s movement and intelligence abilities. She found herself locked in a room with no apparent means of escape. Her task was to unlock the door and make her way out. Can you help her in opening the door?

Exploitation

Just read the source.

Summary

Trapped Source: identify the broken request handling, prove control, and use it to recover the flag.