Add-cart.php Num Patched Jun 2026

Always recompute prices from the server-side database at cart display at order submission.

One of the most common errors in amateur implementations is failing to validate that num is a positive integer. If a user manipulates the URL to read: add-cart.php?id=101&num=-1 add-cart.php num

Many legacy scripts do treat $_GET['num'] as a product identifier to store in a session, but rather as a direct key to query the database: Always recompute prices from the server-side database at

404 NOT FOUND on /add-cart.php?num=' 500 INTERNAL ERROR with num=../config.php add-cart.php num

But that’s too obvious. A more subtle attack: