Never trust user input. When handling the quantity ( num ), ensure it is a positive integer to prevent users from adding negative items (which could reduce their total bill) or non-numeric data that could crash the cart. 2. Maximum Quantity Limits
Redirects the user back to the shopping page or the checkout. The Cybersecurity Context: Why it’s a "Dork" add-cart.php num
The add-cart.php script is often a blind spot for session management. Attackers combine num injection with . Never trust user input
Add a CSRF token to every add‑to‑cart form and verify it on the server: corrupting log files
The newline characters ( \r\n ) inject log entries, corrupting log files, evading intrusion detection systems, or filling disk space (log injection DoS).