Sylius, an Open Source eCommerce Framework on Symfony, contains an authenticated Insecure Direct Object Reference (IDOR) issue in several shop LiveComponents. This is due to unvalidated resource IDs accepted via the #[LiveArg] parameters. Actions accepting resource IDs via #[LiveArg] and loading them with ->find() without ownership validation are affected. Specifically, the Checkout address FormComponent’s `addressFieldUpdated` action accepts an `addressId` via #[LiveArg], potentially exposing another user's personal information including first name, last name, company, phone number, street, city, postcode, and country. The Cart WidgetComponent’s `refreshCart` action and Cart SummaryComponent’s `refreshCart` action both accept a `cartId` via #[LiveArg], allowing direct access to order data such as order total and item count, subtotal, discount, shipping cost, taxes, and order total. Because sylius order contains both active carts and completed orders in the same ID space, the cart IDOR can expose data from all orders.