Add-cart.php — Num

Have you found add-cart.php num in the wild? Share your stories of legacy e-commerce archaeology in the comments below.

Leo clicked through to the checkout table. The order hadn't been placed yet. But the cart's total? $1,197.00. The user had effectively bypassed the "max 1 per customer" rule without triggering a single alarm. Not a hack. Not an SQL injection. Just the ugly poetry of concurrency.

Leo leaned back in his creaking office chair, the glow of three monitors painting his tired face in pale blue light. He was the senior backend engineer for Velvet & Sole , a boutique online shoe retailer that had, against all odds, become a cult hit. Their signature "Dragonhide 7X" boot sold out in eleven minutes every restock. add-cart.php num

Three requests. Same session ID. Same product SKU: DRN-7X .

This article explores the anatomy of the add-cart.php num function, how it operates behind the scenes, the severe security risks associated with improper validation, and how modern developers can secure this essential e-commerce pathway. Have you found add-cart

: Always treat user-supplied data (like the num parameter) as untrusted. Cast it to an integer or validate it against an allowlist before processing.

// add-cart.php session_start(); $product_code = $_GET['num']; // e.g., "TV-42" $price = $_GET['price']; // price passed from client? Big mistake. $_SESSION['cart'][] = [ 'code' => $product_code, 'price' => $price, 'qty' => $_GET['qty'] ]; The order hadn't been placed yet

– 11:34:02.447 POST /add-cart.php HTTP/1.1 – 11:34:02.451 POST /add-cart.php HTTP/1.1 – 11:34:02.453

Let's start with the legacy intent.

To send the data to your script, your product page should use a simple form: