CVE-2026-68501

Workarounds

If you cannot upgrade immediately, patch both endpoints at the project level by decorating
the plugin controllers. The decorators enforce ownership before delegating to the original
controller, so no plugin behaviour is lost. They keep the original orderId request contract,
so no front-end or asset changes are required. Works on both 2.2 and 3.x.

Step 1. Decorate the QR code controller

Create src/Controller/Mollie/SecureQrCodeAction.php in your Sylius project:

<?php

declare(strict_types=1);

namespace App\Controller\Mollie;

use Sylius\Component\Order\Context\CartContextInterface;
use Sylius\Component\Order\Context\CartNotFoundException;
use Sylius\MolliePlugin\Controller\Shop\QrCodeAction;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

final class SecureQrCodeAction
{
    private const OWNED_ORDER_IDS_SESSION_KEY = 'sylius_mollie.owned_order_ids';

    public function __construct(
        private readonly QrCodeAction $inner,
        private readonly CartContextInterface $cartContext,
    ) {
    }

    public function fetchQrCodeFromOrder(Request $request): JsonResponse
    {
        $orderId = $request->get('orderId');

        try {
            $cart = $this->cartContext->getCart();
        } catch (CartNotFoundException) {
            $cart = null;
        }

        if (null !== $orderId && (null === $cart || (string) $cart->getId() !== (string) $orderId)) {
            return new JsonResponse([], Response::HTTP_FORBIDDEN);
        }

        if (null !== $cart && null !== $cart->getId() && $request->hasSession()) {
            $session = $request->getSession();
            $ownedIds = $session->get(self::OWNED_ORDER_IDS_SESSION_KEY, []);
            $ownedIds[(string) $cart->getId()] = true;
            $session->set(self::OWNED_ORDER_IDS_SESSION_KEY, $ownedIds);
        }

        return $this->inner->fetchQrCodeFromOrder($request);
    }

    public function createPayment(Request $request): Response
    {
        return $this->inner->createPayment($request);
    }

    public function removeQrCodeFromOrder(Request $request): JsonResponse
    {
        return $this->inner->removeQrCodeFromOrder($request);
    }
}

Step 2. Decorate the thank-you controller

Create src/Controller/Mollie/SecurePageRedirectController.php:

<?php

declare(strict_types=1);

namespace App\Controller\Mollie;

use Sylius\MolliePlugin\Controller\Shop\PageRedirectController;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Component\Routing\RouterInterface;

final class SecurePageRedirectController
{
    private const OWNED_ORDER_IDS_SESSION_KEY = 'sylius_mollie.owned_order_ids';

    public function __construct(
        private readonly PageRedirectController $inner,
        private readonly RouterInterface $router,
    ) {
    }

    public function thankYouAction(Request $request, SessionInterface $session): RedirectResponse
    {
        $orderId = $request->get('orderId');

        if (null !== $orderId) {
            $ownedIds = $session->get(self::OWNED_ORDER_IDS_SESSION_KEY, []);

            if (!isset($ownedIds[(string) $orderId])) {
                return new RedirectResponse($this->router->generate('sylius_shop_cart_summary'));
            }
        }

        return $this->inner->thankYouAction($request, $session);
    }
}

Step 3. Register the decorators

Append to your project's config/services.yaml:

services:
    App\Controller\Mollie\SecureQrCodeAction:
        decorates: sylius_mollie.controller.shop.qr_code
        public: true
        arguments:
            $inner: '@.inner'
            $cartContext: '@sylius.context.cart'

    App\Controller\Mollie\SecurePageRedirectController:
        decorates: sylius_mollie.controller.shop.page_redirect
        public: true
        arguments:
            $inner: '@.inner'
            $router: '@router'

Both decorators keep @.inner and only add an ownership check on orderId before handing
the request to the original action, so createPayment, removeQrCodeFromOrder and the
thank-you redirect all keep their original behaviour and the front-end contract is unchanged.

Step 4. Clear the cache

bin/console cache:clear