Media

Sylius PayPal Plugin has an Order Manipulation Vulnerability after PayPal Checkout

Publicada: 19.03.2025
Actualizado: 11.10.2026 10:22

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 $paymentStateManager) {
    }

    public function completePayPalOrder(OrderInterface $order): void
    {
        $payment = $order->getLastPayment(PaymentInterface::STATE_PROCESSING);
        if ($payment === null) {
            return;
        }

        /** @var PaymentMethodInterface $paymentMethod */
        $paymentMethod = $payment->getMethod();
        /** @var GatewayConfigInterface $gatewayConfig */
        $gatewayConfig = $paymentMethod->getGatewayConfig();

        if ($gatewayConfig->getFactoryName() !== 'sylius.pay_pal') {
            return;
        }

        try {
            $this->verify($payment);
        } catch (\Exception) {
            $this->paymentStateManager->cancel($payment);

            return;
        }

        $this->paymentStateManager->complete($payment);
    }

    private function verify(PaymentInterface $payment): void
    {
        $totalAmount = $this->getTotalPaymentAmountFromPaypal($payment);

        if ($payment->getOrder()->getTotal() !== $totalAmount) {
            throw new \Exception();
        }
    }

    private function getTotalPaymentAmountFromPaypal(PaymentInterface $payment): int
    {
        $details = $payment->getDetails();

        return $details['payment_amount'] ?? 0;
    }
}

IMPORTANT

For PayPalPlugin 2.x change:

php

$gatewayConfig->getFactoryName() !== 'sylius.pay_pal'

php

$gatewayConfig->getFactoryName() !== SyliusPayPalExtension::PAYPAL_FACTORY_NAME

Also there is a need to overwrite CompletePayPalOrderListener with modified logic:

php

<?php

declare(strict_types=1);

namespace App\EventListener\Workflow;

use App\Processor\PayPalOrderCompleteProcessor;
use Sylius\Component\Core\Model\OrderInterface;
use Symfony\Component\Workflow\Event\CompletedEvent;
use Webmozart\Assert\Assert;

final class CompletePayPalOrderListener
{
    public function __construct(private readonly PayPalOrderCompleteProcessor $completeProcessor)
    {
    }

    public function __invoke(CompletedEvent $event): void
    {
        /** @var OrderInterface $order */
        $order = $event->getSubject();
        Assert::isInstanceOf($order, OrderInterface::class);

        $this->completeProcessor->completePayPalOrder($order);
    }
}

And to overwrite CaptureAction with modified logic (if you didn't have it already):

php

<?php

declare(strict_types=1);

namespace App\Payum\Action;

use Payum\Core\Action\ActionInterface;
use Payum\Core\Exception\RequestNotSupportedException;
use Payum\Core\Request\Capture;
use Sylius\Component\Core\Model\PaymentInterface;
use Sylius\Component\Core\Model\PaymentMethodInterface;
use Sylius\PayPalPlugin\Api\CacheAuthorizeClientApiInterface;
use Sylius\PayPalPlugin\Api\CreateOrderApiInterface;
use Sylius\PayPalPlugin\Payum\Action\StatusAction;
use Sylius\PayPalPlugin\Provider\UuidProviderInterface;

final class CaptureAction implements ActionInterface
{
    public function __construct(
        private CacheAuthorizeClientApiInterface $authorizeClientApi,
        private CreateOrderApiInterface $createOrderApi,
        private UuidProviderInterface $uuidProvider,
    ) {
    }

    /** @param Capture $request */
    public function execute($request): void
    {
        RequestNotSupportedException::assertSupports($this, $request);

        /** @var PaymentInterface $payment */
        $payment = $request->getModel();
        /** @var PaymentMethodInterface $paymentMethod */
        $paymentMethod = $payment->getMethod();

        $token = $this->authorizeClientApi->authorize($paymentMethod);

        $referenceId = $this->uuidProvider->provide();
        $content = $this->createOrderApi->create($token, $payment, $referenceId);

        if ($content['status'] === 'CREATED') {
            $payment->setDetails([
                'status' => StatusAction::STATUS_CAPTURED,
                'paypal_order_id' => $content['id'],
                'reference_id' => $referenceId,
                'payment_amount' => $payment->getAmount(),
            ]);
        }
    }

    public function supports($request): bool
    {
        return
            $request instanceof Capture &&
            $request->getModel() instanceof PaymentInterface
        ;
    }
}

After that, register services in the container when using PayPal 1.x:

yaml

Sylius\PayPalPlugin\EventListener\Workflow\CompletePayPalOrderListener:
    class: App\EventListener\Workflow\CompletePayPalOrderListener
    public: true
    arguments:
        - '@Sylius\PayPalPlugin\Processor\PayPalOrderCompleteProcessor'
    tags: 
        - { name: 'kernel.event_listener', event: 'workflow.sylius_order_checkout.completed.complete', priority: 100 }
    
Sylius\PayPalPlugin\Processor\PayPalOrderCompleteProcessor:
    class: App\Processor\PayPalOrderCompleteProcessor
    public: true
    arguments:
        - '@Sylius\PayPalPlugin\Manager\PaymentStateManagerInterface'

Sylius\PayPalPlugin\Payum\Action\CaptureAction:
    class: App\Payum\Action\CaptureAction
    public: true
    arguments:
        - '@Sylius\PayPalPlugin\Api\CacheAuthorizeClientApiInterface'
        - '@Sylius\PayPalPlugin\Api\CreateOrderApiInterface'
        - '@Sylius\PayPalPlugin\Provider\UuidProviderInterface'
    tags:
        - { name: 'payum.action', factory: 'sylius.pay_pal', alias: 'payum.action.capture' }

or when using PayPal 2.x:

yaml

sylius_paypal.listener.workflow.complete_paypal_order:
    class: App\EventListener\Workflow\CompletePayPalOrderListener
    public: true
    arguments:
        - '@sylius_paypal.processor.paypal_order_complete'
    tags: 
        - { name: 'kernel.event_listener', event: 'workflow.sylius_order_checkout.completed.complete', priority: 100 }
    
sylius_paypal.processor.paypal_order_complete:
    class: App\Processor\PayPalOrderCompleteProcessor
    public: true
    arguments:
        - '@sylius_paypal.manager.payment_state'

sylius_paypal.payum.action.capture:
    class: App\Payum\Action\CaptureAction
    public: true
    arguments:
        - '@sylius_paypal.api.cache_authorize_client'
        - '@sylius_paypal.api.create_order'
        - '@sylius_paypal.provider.uuid'
    tags:
        - { name: 'payum.action', factory: 'sylius.paypal', alias: 'payum.action.capture' }

For more information

If you have any questions or comments about this advisory:

Open an issue in Sylius issues
Email us at security@sylius.com

Software afectado

Haz clic en una tecnología para ver todas sus vulnerabilidades.

Plataforma	Paquete	Versiones vulnerables	Corregida en
Paquete de Composer	sylius/paypal-plugin	< 1.6.2, >= 1.7.0, < 1.7.2, >= 2.0.0, < 2.0.2	1.6.2, 1.7.2, 2.0.2

Referencias

Puntuación CVSS 6.5/10

Vector CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Debilidad (CWE): CWE-472
Plataforma: Composer
Paquete: sylius/paypal-plugin
Publicada: 19.03.2025
Actualizado: 11.10.2026 10:22

Fuentes y licencias

OSV / GitHub Advisory Database - GHSA-hxg4-65p5-9w37 - CC BY 4.0

Historial de vulnerabilidades: sylius/paypal-plugin

Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.

Entradas en total: 3
Primera → última: 10.2021 03.2025
Sin corrección: 0
Explotada en ataques: 0

Distribución por gravedad

Alta 1
Media 2

Divulgaciones por año

2021: 1
2022: 0
2023: 0
2024: 0
2025: 2
2026: 0

19.03.2025

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