diff --git a/vendor/magento/module-configurable-product/Plugin/Model/ResourceModel/Attribute/ScopedOptionSelectBuilder.php b/vendor/magento/module-configurable-product/Plugin/Model/ResourceModel/Attribute/ScopedOptionSelectBuilder.php
new file mode 100644
index 000000000000..20d1ac0c2d37
--- /dev/null
+++ b/vendor/magento/module-configurable-product/Plugin/Model/ResourceModel/Attribute/ScopedOptionSelectBuilder.php
@@ -0,0 +1,61 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\ConfigurableProduct\Plugin\Model\ResourceModel\Attribute;
+
+use Magento\Catalog\Model\ResourceModel\Product\Website as ProductWebsiteResource;
+use Magento\ConfigurableProduct\Model\ResourceModel\Attribute\OptionSelectBuilderInterface;
+use Magento\Framework\DB\Select;
+use Magento\Store\Model\StoreManagerInterface;
+
+/**
+ * Plugin for OptionSelectBuilderInterface to filter by website assignments.
+ */
+class ScopedOptionSelectBuilder
+{
+    /**
+     * @var StoreManagerInterface
+     */
+    private $storeManager;
+
+    /**
+     * @var ProductWebsiteResource
+     */
+    private $productWebsiteResource;
+
+    /**
+     * @param StoreManagerInterface $storeManager
+     * @param ProductWebsiteResource $productWebsiteResource
+     */
+    public function __construct(
+        StoreManagerInterface $storeManager,
+        ProductWebsiteResource $productWebsiteResource
+    ) {
+        $this->storeManager = $storeManager;
+        $this->productWebsiteResource = $productWebsiteResource;
+    }
+
+    /**
+     * Add website filter to select.
+     *
+     * @param OptionSelectBuilderInterface $subject
+     * @param Select $select
+     * @return Select
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     */
+    public function afterGetSelect(OptionSelectBuilderInterface $subject, Select $select)
+    {
+        $store = $this->storeManager->getStore();
+        $select->joinInner(
+            ['entity_website' => $this->productWebsiteResource->getMainTable()],
+            'entity_website.product_id = entity.entity_id AND entity_website.website_id = ' . $store->getWebsiteId(),
+            []
+        );
+
+        return $select;
+    }
+}
diff --git a/vendor/magento/module-configurable-product/etc/frontend/di.xml b/vendor/magento/module-configurable-product/etc/frontend/di.xml
index 3942ec52cbb8..56418bbaad12 100644
--- a/vendor/magento/module-configurable-product/etc/frontend/di.xml
+++ b/vendor/magento/module-configurable-product/etc/frontend/di.xml
@@ -9,6 +9,7 @@
         xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
     <type name="Magento\ConfigurableProduct\Model\ResourceModel\Attribute\OptionSelectBuilderInterface">
         <plugin name="Magento_ConfigurableProduct_Plugin_Model_ResourceModel_Attribute_InStockOptionSelectBuilder" type="Magento\ConfigurableProduct\Plugin\Model\ResourceModel\Attribute\InStockOptionSelectBuilder"/>
+        <plugin name="option_select_website_filter" type="Magento\ConfigurableProduct\Plugin\Model\ResourceModel\Attribute\ScopedOptionSelectBuilder"/>
     </type>
     <type name="Magento\ConfigurableProduct\Model\Product\Type\Configurable">
         <plugin name="used_products_cache" type="Magento\ConfigurableProduct\Model\Plugin\Frontend\UsedProductsCache" />
diff --git a/vendor/magento/module-configurable-product-graph-ql/Model/Variant/Collection.php b/vendor/magento/module-configurable-product-graph-ql/Model/Variant/Collection.php
index cd6d78e5c3ff..7a327305fd27 100644
--- a/vendor/magento/module-configurable-product-graph-ql/Model/Variant/Collection.php
+++ b/vendor/magento/module-configurable-product-graph-ql/Model/Variant/Collection.php
@@ -120,10 +120,10 @@ public function addEavAttributes(array $attributeCodes) : void
      * Retrieve child products from for passed in parent id.
      *
      * @param int $id
-     * @param ContextInterface|null $context
+     * @param ContextInterface $context
      * @return array
      */
-    public function getChildProductsByParentId(int $id, ContextInterface $context = null) : array
+    public function getChildProductsByParentId(int $id, ContextInterface $context) : array
     {
         $childrenMap = $this->fetch($context);
 
@@ -137,10 +137,10 @@ public function getChildProductsByParentId(int $id, ContextInterface $context =
     /**
      * Fetch all children products from parent id's.
      *
-     * @param ContextInterface|null $context
+     * @param ContextInterface $context
      * @return array
      */
-    private function fetch(ContextInterface $context = null) : array
+    private function fetch(ContextInterface $context) : array
     {
         if (empty($this->parentProducts) || !empty($this->childrenMap)) {
             return $this->childrenMap;
@@ -151,6 +151,7 @@ private function fetch(ContextInterface $context = null) : array
             /** @var ChildCollection $childCollection */
             $childCollection = $this->childCollectionFactory->create();
             $childCollection->setProductFilter($product);
+            $childCollection->addWebsiteFilter($context->getExtensionAttributes()->getStore()->getWebsiteId());
             $this->collectionProcessor->process(
                 $childCollection,
                 $this->searchCriteriaBuilder->create(),
diff --git a/vendor/magento/module-configurable-product-graph-ql/etc/graphql/di.xml b/vendor/magento/module-configurable-product-graph-ql/etc/graphql/di.xml
index 06206e35712a..56cff716ab6f 100644
--- a/vendor/magento/module-configurable-product-graph-ql/etc/graphql/di.xml
+++ b/vendor/magento/module-configurable-product-graph-ql/etc/graphql/di.xml
@@ -50,6 +50,7 @@
 
     <type name="Magento\ConfigurableProduct\Model\ResourceModel\Attribute\OptionSelectBuilderInterface">
         <plugin name="Magento_ConfigurableProduct_Plugin_Model_ResourceModel_Attribute_InStockOptionSelectBuilder_GraphQl" type="Magento\ConfigurableProduct\Plugin\Model\ResourceModel\Attribute\InStockOptionSelectBuilder"/>
+        <plugin name="option_select_website_filter" type="Magento\ConfigurableProduct\Plugin\Model\ResourceModel\Attribute\ScopedOptionSelectBuilder"/>
     </type>
 
     <type name="Magento\StoreGraphQl\Model\Resolver\Store\StoreConfigDataProvider">