Moanshop.7z -

The application uses a vulnerable library (like lodash or merge-deep ) to combine user input into a configuration object.

Triggers a system command (e.g., cat /flag.txt ) to read the secret flag. moanshop.7z

An attacker sends a JSON payload containing the __proto__ key. This allows them to inject properties into the global object prototype, effectively changing the behavior of the entire application. 3. From Pollution to Remote Code Execution (RCE) The application uses a vulnerable library (like lodash

Overwriting settings in the rendering engine (like EJS or Pug) to force the server to execute malicious system commands. Summary of the Solution To solve the challenge, a researcher typically: Downloads and extracts the moanshop.7z file. moanshop.7z