Add-cart.php Num 2021 -

If the checkout process uses $_SESSION['cart'] as the source of truth without re-fetching prices, the attacker buys 99 gift cards for free.

Three requests. Same session ID. Same product SKU: DRN-7X . add-cart.php num

Even worse: some implementations allow num to be a like 101_2 to denote product variant ID, leading to IDOR (Insecure Direct Object Reference) attacks where an attacker can add another user's private or unpublished product to their cart. If the checkout process uses $_SESSION['cart'] as the

$stmt = $db->prepare("SELECT * FROM products WHERE legacy_num = ?"); $stmt->execute([$_POST['legacy_num']]); Same product SKU: DRN-7X

The add-cart.php script relies heavily on PHP sessions ( $_SESSION ). Since HTTP is a stateless protocol, the server needs a way to remember that "User A" has "Product 101, Quantity 2" in their cart. The script typically initializes a session, creates an array structure representing the cart, and stores the product ID and the num value within it.