Add-cart.php Num May 2026

Never trust user input. Always validate data types. Never use GET requests to modify state. And for the love of security, move away from raw add-cart.php scripts and toward modern, token-authenticated POST endpoints.

The attacker uses Burp Suite to fuzz the num parameter with a payload list: 1 , 1.1 , -1 , 999999 , 1 UNION SELECT 1 , 1%00 .

If you currently have add-cart.php?num= in production, stop reading and go audit it now. Your users’ data—and your business—depend on it. add-cart.php num

// Vulnerable code $id = $_GET['num']; $result = mysqli_query($conn, "SELECT * FROM products WHERE id = $id"); An attacker submits: add-cart.php?num=1 UNION SELECT username, password FROM users--

$_SESSION['last_cart_action'] = time(); Use this checklist to test if your add-cart.php script is secure. Never trust user input

The attacker crafts add-cart.php?num=12 AND 1=2 UNION SELECT database()-- - . The cart page inadvertently displays the database name (e.g., "vintage_store_db") because the product name lookup fails and falls back to the error message.

https://vintage-books.com/add-cart.php?num=12 And for the love of security, move away from raw add-cart

if (isset($_SESSION['last_cart_action']) && (time() - $_SESSION['last_cart_action']) < 0.5) header('HTTP/1.1 429 Too Many Requests'); exit;