MAGETWO-92175: Wrong product grid behavior in admin panel

Author: Roman Leshchenko

app/code/Magento/Catalog/Controller/Adminhtml/Product/MassDelete.php

@@ -11,6 +11,7 @@
 use Magento\Ui\Component\MassAction\Filter;
 use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;
 use Magento\Catalog\Api\ProductRepositoryInterface;
+use Magento\Framework\Exception\NotFoundException;
 
 class MassDelete extends \Magento\Catalog\Controller\Adminhtml\Product
 {
@@ -54,9 +55,15 @@ public function __construct(
 
     /**
      * @return \Magento\Backend\Model\View\Result\Redirect
+     * @throws NotFoundException
+     * @throws \Magento\Framework\Exception\LocalizedException
+     * @throws \Magento\Framework\Exception\StateException
      */
     public function execute()
     {
+        if (!$this->getRequest()->isPost()) {
+            throw new NotFoundException(__('Page not found'));
+        }
         $collection = $this->filter->getCollection($this->collectionFactory->create());
         $productDeleted = 0;
         /** @var \Magento\Catalog\Model\Product $product */