The Syliud PayPal Plugin is the Sylius Core Team’s plugin for the PayPal Commerce Platform. Prior to 1.6.2, 1.7.2, and 2.0.2, a discovered vulnerability allows users to modify their shopping cart after completing the PayPal Checkout process and payment authorization. If a user initiates a PayPal transaction from a product page or the cart page and then returns to the order summary page, they can still manipulate the cart contents before finalizing the order. As a result, the order amount in Sylius may be higher than the amount actually captured by PayPal, leading to a scenario where merchants deliver products or services without full payment. The issue is fixed in versions: 1.6.2, 1.7.2, 2.0.2 and above.

Affected: Packagist: sylius/paypal-plugin

A discovered vulnerability allows users to modify their shopping cart after completing the PayPal Checkout process and payment authorization. If a user initiates a PayPal transaction from a product page or the cart page and then returns to the order summary page, they can still manipulate the cart contents before finalizing the order. As a result, the order amount in Sylius may be higher than the amount actually captured by PayPal, leading to a scenario where merchants deliver products or services without full payment.

### Impact

- Users can exploit this flaw to receive products/services without paying the full amount. - Merchants may suffer financial losses due to underpaid orders. - Trust in the integrity of the payment process is compromised.

### Patches

The issue is fixed in versions: 1.6.2, 1.7.2, 2.0.2 and above.

### Workarounds

To resolve the problem in the end application without updating to the newest patches, there is a need to overwrite `PayPalOrderCompleteProcessor` with modified logic:

```php <?php

declare(strict_types=1);

namespace App\Processor;

use Sylius\Bundle\PayumBundle\Model\GatewayConfigInterface; use Sylius\Component\Core\Model\OrderInterface; use Sylius\Component\Core\Model\PaymentInterface; use Sylius\Component\Core\Model\PaymentMethodInterface; use Sylius\PayPalPlugin\Manager\PaymentStateManagerInterface;

final class PayPalOrderCompleteProcessor { public function __construct(private readonly PaymentStateManagerInterface $paymentStateM…