Add-cart.php Num ⭐

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.

Understanding add-cart.php num: E-Commerce Architecture and Security

$stmt = $pdo->prepare($sql);

If you do not implement strict numerical controls over incoming data parameters like product_id and quantity , your platform faces high risks. Attackers can leverage these flaws for logic exploitation, price manipulation, and SQL injection attacks.

// Secure Code $quantity = intval($_GET['num']); add-cart.php num

By implementing add-cart.php num correctly, you empower users to customize their shopping experience, leading to higher satisfaction and potentially larger order volumes.

| Attribute | Details | |-----------|---------| | | num (could also be qty , quantity , product_qty ) | | Type | Integer | | Source | Usually sent via POST (or GET ) from a product form | | Validation Rules | Must be positive integer, >= 1, often capped at a max (e.g., 999) | | Default | If missing, defaults to 1 |

The fundamental problem with add-cart.php?num= is that it exposes via idempotent HTTP GET requests . Search engines, pre-fetching browsers, and automated scanners can all trigger cart changes unintentionally.

Since you did not specify the context (e.g., a specific framework like Laravel, a CMS like WordPress/WooCommerce, or a course assignment), I have written a comprehensive, focused on the core principles of building an add-cart.php script using PHP and MySQL with PDO (PHP Data Objects) . The attacker crafts add-cart

$stmt = $conn->prepare("SELECT price, stock FROM products WHERE id = ? AND active = 1"); $stmt->bind_param("i", $product_id); $stmt->execute();

If the $num variable is passed directly into a database query to check for stock without sanitization, the application becomes vulnerable to SQL injection.

| Test Case | Expected Behavior | Your Result | |-----------|------------------|--------------| | num=abc | 400 Bad Request / No change to cart | | | num=-5 | Ignored or default to 1 | | | num=1.5 | Reject as invalid integer | | | num=9999999 | Reject (max allowed quantity) | | | num=1%20OR%201=1 | No SQL error, no data leak | | | No num parameter | 400 Bad Request | | | Repeated requests to same num | Throttled after X requests/second | | | CSRF token missing | Cart not modified | |

$product_id = filter_input(INPUT_POST, 'product_id', FILTER_VALIDATE_INT, ['options' => ['min_range' => 1]]); $quantity = filter_input(INPUT_POST, 'quantity', FILTER_VALIDATE_INT, ['options' => ['min_range' => 1, 'max_range' => 99]]); Attackers can leverage these flaws for logic exploitation,

// JSON response for AJAX header('Content-Type: application/json'); echo json_encode([ 'status' => 'success', 'cart_count' => array_sum($_SESSION['cart']), 'message' => "$quantity item(s) added." ]);

Separate your parameters clearly. Use:

If num represents the quantity, a lack of strict validation can break the business logic.