CVE-2025-29788

The Syliud PayPal Plugin is the Sylius Core Team’s plugin for the PayPal Commerce Platform. A vulnerability in versions prior to 1.6.1, 1.7.1, and 2.0.1 allows users to manipulate the final payment amount processed by PayPal. If a user modifies the item quantity in their shopping cart after initiating the PayPal Express Checkout process, PayPal will not receive the updated total amount. As a result, PayPal captures only the initially transmitted amount, while Sylius incorrectly considers the order fully paid based on the modified total. This flaw can be exploited both accidentally and intentionally, potentially enabling fraud by allowing customers to pay less than the actual order value. Attackers can intentionally pay less than the actual total order amount, business owners may suffer financial losses due to underpaid orders, and integrity of payment processing is compromised. The issue is fixed in versions 1.6.1, 1.7.1, 2.0.1, and above. To resolve the problem in the end application without updating to the newest patches, there is a need to overwrite ProcessPayPalOrderAction, CompletePayPalOrderFromPaymentPageAction, and CaptureAction with modified logic.

The Syliud PayPal Plugin is the Sylius Core Team’s plugin for the PayPal Commerce Platform. A vulnerability in versions prior to 1.6.1, 1.7.1, and 2.0.1 allows users to manipulate the final payment amount processed by PayPal. If a user modifies the item quantity in their shopping cart after initiating the PayPal Express Checkout process, PayPal will not receive the updated total amount. As a result, PayPal captures only the initially transmitted amount, while Sylius incorrectly considers the order fully paid based on the modified total. This flaw can be exploited both accidentally and intentionally, potentially enabling fraud by allowing customers to pay less than the actual order value. Attackers can intentionally pay less than the actual total order amount, business owners may suffer financial losses due to underpaid orders, and integrity of payment processing is compromised. The issue is fixed in versions 1.6.1, 1.7.1, 2.0.1, and above. To resolve the problem in the end application without updating to the newest patches, there is a need to overwrite ProcessPayPalOrderAction, CompletePayPalOrderFromPaymentPageAction, and CaptureAction with modified logic.

A vulnerability allows users to manipulate the final payment amount processed by PayPal. If a user modifies the item quantity in their shopping cart after initiating the PayPal Checkout process, PayPal will not receive the updated total amount. As a result, PayPal captures only the initially transmitted amount, while Sylius incorrectly considers the order fully paid based on the modified total. This flaw can be exploited both accidentally and intentionally, potentially enabling fraud by allowing customers to pay less than the actual order value.

Impact

• Attackers can intentionally pay less than the actual total order amount.
• Business owners may suffer financial losses due to underpaid orders.
• Integrity of payment processing is compromised.

Patches

The issue is fixed in versions: 1.6.1, 1.7.1, 2.0.1 and above.

Workarounds

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

<?php

declare(strict_types=1);

namespace App\Controller;

use Doctrine\Persistence\ObjectManager;
use SM\Factory\FactoryInterface as StateMachineFactoryInterface;
use Sylius\Abstraction\StateMachine\StateMachineInterface;
use Sylius\Abstraction\StateMachine\WinzouStateMachineAdapter;
use Sylius\Component\Core\Factory\AddressFactoryInterface;
use Sylius\Component\Core\Model\CustomerInterface;
use Sylius\Component\Core\Model\PaymentInterface;
use Sylius\Component\Core\Model\PaymentMethodInterface;
use Sylius\Component\Core\OrderCheckoutTransitions;
use Sylius\Component\Core\Repository\CustomerRepositoryInterface;
use Sylius\Component\Resource\Factory\FactoryInterface;
use Sylius\PayPalPlugin\Api\CacheAuthorizeClientApiInterface;
use Sylius\PayPalPlugin\Api\OrderDetailsApiInterface;
use Sylius\PayPalPlugin\Manager\PaymentStateManagerInterface;
use Sylius\PayPalPlugin\Provider\OrderProviderInterface;
use Sylius\PayPalPlugin\Verifier\PaymentAmountVerifierInterface;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

final class ProcessPayPalOrderAction
{
    public function __construct(
        private readonly CustomerRepositoryInterface $customerRepository,
        private readonly FactoryInterface $customerFactory,
        private readonly AddressFactoryInterface $addressFactory,
        private readonly ObjectManager $orderManager,
        private readonly StateMachineFactoryInterface|StateMachineInterface $stateMachineFactory,
        private readonly PaymentStateManagerInterface $paymentStateManager,
        private readonly CacheAuthorizeClientApiInterface $authorizeClientApi,
        private readonly OrderDetailsApiInterface $orderDetailsApi,
        private readonly OrderProviderInterface $orderProvider,
    ) {
    }

    public function __invoke(Request $request): Response
    {
        $orderId = $request->request->getInt('orderId');
        $order = $this->orderProvider->provideOrderById($orderId);
        /** @var PaymentInterface $payment */
        $payment = $order->getLastPayment(PaymentInterface::STATE_CART);

        $data = $this->getOrderDetails((string) $request->request->get('payPalOrderId'), $payment);

        /** @var CustomerInterface|null $customer */
        $customer = $order->getCustomer();
        if ($customer === null) {
            $customer = $this->getOrderCustomer($data['payer']);
            $order->setCustomer($customer);
        }

        $purchaseUnit = (array) $data['purchase_units'][0];

        $address = $this->addressFactory->createNew();

        if ($order->isShippingRequired()) {
            $name = explode(' ', $purchaseUnit['shipping']['name']['full_name']);
            $address->setLastName(array_pop($name) ?? '');
            $address->setFirstName(implode(' ', $name));
            $address->setStreet($purchaseUnit['shipping']['address']['address_line_1']);
           …

The Syliud PayPal Plugin is the Sylius Core Team’s plugin for the PayPal Commerce Platform. A vulnerability in versions prior to 1.6.1, 1.7.1, and 2.0.1 allows users to manipulate the final payment amount processed by PayPal. If a user modifies the item quantity in their shopping cart after initiating the PayPal Express Checkout process, PayPal will not receive the updated total amount. As a result, PayPal captures only the initially transmitted amount, while Sylius incorrectly considers the order fully paid based on the modified total. This flaw can be exploited both accidentally and intentionally, potentially enabling fraud by allowing customers to pay less than the actual order value. Attackers can intentionally pay less than the actual total order amount, business owners may suffer financial losses due to underpaid orders, and integrity of payment processing is compromised. The issue is fixed in versions 1.6.1, 1.7.1, 2.0.1, and above. To resolve the problem in the end application without updating to the newest patches, there is a need to overwrite ProcessPayPalOrderAction, CompletePayPalOrderFromPaymentPageAction, and CaptureAction with modified logic.

The Syliud PayPal Plugin is the Sylius Core Team’s plugin for the PayPal Commerce Platform. A vulnerability in versions prior to 1.6.1, 1.7.1, and 2.0.1 allows users to manipulate the final payment amount processed by PayPal. If a user modifies the item quantity in their shopping cart after initiating the PayPal Express Checkout process, PayPal will not receive the updated total amount. As a result, PayPal captures only the initially transmitted amount, while Sylius incorrectly considers the order fully paid based on the modified total. This flaw can be exploited both accidentally and intentionally, potentially enabling fraud by allowing customers to pay less than the actual order value. Attackers can intentionally pay less than the actual total order amount, business owners may suffer financial losses due to underpaid orders, and integrity of payment processing is compromised. The issue is fixed in versions 1.6.1, 1.7.1, 2.0.1, and above. To resolve the problem in the end application without updating to the newest patches, there is a need to overwrite ProcessPayPalOrderAction, CompletePayPalOrderFromPaymentPageAction, and CaptureAction with modified logic.

A vulnerability allows users to manipulate the final payment amount processed by PayPal. If a user modifies the item quantity in their shopping cart after initiating the PayPal Checkout process, PayPal will not receive the updated total amount. As a result, PayPal captures only the initially transmitted amount, while Sylius incorrectly considers the order fully paid based on the modified total. This flaw can be exploited both accidentally and intentionally, potentially enabling fraud by allowing customers to pay less than the actual order value.

Impact

• Attackers can intentionally pay less than the actual total order amount.
• Business owners may suffer financial losses due to underpaid orders.
• Integrity of payment processing is compromised.

Patches

The issue is fixed in versions: 1.6.1, 1.7.1, 2.0.1 and above.

Workarounds

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

<?php

declare(strict_types=1);

namespace App\Controller;

use Doctrine\Persistence\ObjectManager;
use SM\Factory\FactoryInterface as StateMachineFactoryInterface;
use Sylius\Abstraction\StateMachine\StateMachineInterface;
use Sylius\Abstraction\StateMachine\WinzouStateMachineAdapter;
use Sylius\Component\Core\Factory\AddressFactoryInterface;
use Sylius\Component\Core\Model\CustomerInterface;
use Sylius\Component\Core\Model\PaymentInterface;
use Sylius\Component\Core\Model\PaymentMethodInterface;
use Sylius\Component\Core\OrderCheckoutTransitions;
use Sylius\Component\Core\Repository\CustomerRepositoryInterface;
use Sylius\Component\Resource\Factory\FactoryInterface;
use Sylius\PayPalPlugin\Api\CacheAuthorizeClientApiInterface;
use Sylius\PayPalPlugin\Api\OrderDetailsApiInterface;
use Sylius\PayPalPlugin\Manager\PaymentStateManagerInterface;
use Sylius\PayPalPlugin\Provider\OrderProviderInterface;
use Sylius\PayPalPlugin\Verifier\PaymentAmountVerifierInterface;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

final class ProcessPayPalOrderAction
{
    public function __construct(
        private readonly CustomerRepositoryInterface $customerRepository,
        private readonly FactoryInterface $customerFactory,
        private readonly AddressFactoryInterface $addressFactory,
        private readonly ObjectManager $orderManager,
        private readonly StateMachineFactoryInterface|StateMachineInterface $stateMachineFactory,
        private readonly PaymentStateManagerInterface $paymentStateManager,
        private readonly CacheAuthorizeClientApiInterface $authorizeClientApi,
        private readonly OrderDetailsApiInterface $orderDetailsApi,
        private readonly OrderProviderInterface $orderProvider,
    ) {
    }

    public function __invoke(Request $request): Response
    {
        $orderId = $request->request->getInt('orderId');
        $order = $this->orderProvider->provideOrderById($orderId);
        /** @var PaymentInterface $payment */
        $payment = $order->getLastPayment(PaymentInterface::STATE_CART);

        $data = $this->getOrderDetails((string) $request->request->get('payPalOrderId'), $payment);

        /** @var CustomerInterface|null $customer */
        $customer = $order->getCustomer();
        if ($customer === null) {
            $customer = $this->getOrderCustomer($data['payer']);
            $order->setCustomer($customer);
        }

        $purchaseUnit = (array) $data['purchase_units'][0];

        $address = $this->addressFactory->createNew();

        if ($order->isShippingRequired()) {
            $name = explode(' ', $purchaseUnit['shipping']['name']['full_name']);
            $address->setLastName(array_pop($name) ?? '');
            $address->setFirstName(implode(' ', $name));
            $address->setStreet($purchaseUnit['shipping']['address']['address_line_1']);
           …