Identifies a vulnerable merge function in the cart.js or admin.js file.

The .7z file contains the application's backend logic, often written in or Python (Flask/Django) . By analyzing the code, researchers look for:

In this challenge, participants are presented with a compressed archive ( .7z ) containing the source code for a fictional online storefront called "Moan Shop." The objective is to identify and exploit vulnerabilities within the application to retrieve a hidden "flag"—a specific string of text that proves the system was successfully breached.

Once the attacker can "pollute" the global object, they target specific application behaviors to gain control:

Injecting an isAdmin: true property into the prototype so that every user session is treated as an administrator.

In many versions of the "Moan Shop" challenge, the vulnerability is .

Triggers a system command (e.g., cat /flag.txt ) to read the secret flag.