If you are maintaining an older e-commerce application using the add-cart.php?num= pattern, auditing your code against these security standards is essential to protect your business and your customers' data.

An attacker can trick a logged‑in user into clicking a hidden link that adds products to their cart without their knowledge. This is a attack, not a direct session theft.

Developers typically use one of two primary approaches to manage this data: Session-Based Storage: The script stores the product ID and its corresponding

If the item already exists in the cart, the script increments the count; otherwise, it adds a new entry. 2. Security and Discovery Context

Understanding add-cart.php num : Implementing Dynamic Shopping Cart Quantities

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