diff --git a/vendor/magento/module-catalog-permissions/Model/Plugin/RecollectQuoteWithCatalogPermission.php b/vendor/magento/module-catalog-permissions/Model/Plugin/RecollectQuoteWithCatalogPermission.php
new file mode 100644
index 00000000000..0c211cbc05c
--- /dev/null
+++ b/vendor/magento/module-catalog-permissions/Model/Plugin/RecollectQuoteWithCatalogPermission.php
@@ -0,0 +1,138 @@
+<?php
+/**
+ * ADOBE CONFIDENTIAL
+ *
+ * Copyright 2026 Adobe
+ * All Rights Reserved.
+ *
+ * NOTICE: All information contained herein is, and remains
+ * the property of Adobe and its suppliers, if any. The intellectual
+ * and technical concepts contained herein are proprietary to Adobe
+ * and its suppliers and are protected by all applicable intellectual
+ * property laws, including trade secret and copyright laws.
+ * Dissemination of this information or reproduction of this material
+ * is strictly forbidden unless prior written permission is obtained
+ * from Adobe.
+ */
+declare(strict_types=1);
+
+namespace Magento\CatalogPermissions\Model\Plugin;
+
+use Magento\CatalogPermissions\Model\VerifyQuoteItemPermissionAfterGroupChange;
+use Magento\Customer\Api\CustomerRepositoryInterface;
+use Magento\Customer\Model\Config\Share;
+use Magento\Customer\Model\Customer;
+use Magento\Customer\Model\ResourceModel\Customer as CustomerResource;
+use Magento\Framework\App\Config\ScopeConfigInterface;
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Framework\Model\AbstractModel;
+use Magento\Quote\Api\CartRepositoryInterface;
+use Magento\Quote\Model\Quote;
+use Magento\Store\Model\StoreManagerInterface;
+
+/**
+ * Recollect quote when customer group with catalog permissions updated
+ *
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ */
+class RecollectQuoteWithCatalogPermission
+{
+    /**
+     * @param CartRepositoryInterface $cartRepository
+     * @param CustomerRepositoryInterface $customerRepository
+     * @param ScopeConfigInterface $scopeConfig
+     * @param StoreManagerInterface $storeManager
+     * @param VerifyQuoteItemPermissionAfterGroupChange $verifyPermission
+     */
+    public function __construct(
+        private readonly CartRepositoryInterface $cartRepository,
+        private readonly CustomerRepositoryInterface $customerRepository,
+        private readonly ScopeConfigInterface $scopeConfig,
+        private readonly StoreManagerInterface $storeManager,
+        private readonly VerifyQuoteItemPermissionAfterGroupChange $verifyPermission
+    ) {
+    }
+
+    /**
+     * Plugin around create customer that triggers to update and recollect all customer cart
+     *
+     * @param CustomerResource $subject
+     * @param callable $proceed
+     * @param AbstractModel $customer
+     * @return CustomerResource
+     *
+     * @throws LocalizedException
+     * @throws NoSuchEntityException
+     * @SuppressWarnings(PHPMD.CyclomaticComplexity)
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     */
+    public function aroundSave(
+        CustomerResource $subject,
+        callable $proceed,
+        AbstractModel $customer
+    ): CustomerResource {
+        $customerId = $customer->getId() ?: $customer->getEntityId();
+        $previousCustomerData = [];
+        /** @var Customer $customer */
+        if ($customerId && empty($customer->getTaxvat())) {
+            try {
+                $prevCustomerData = $this->customerRepository->getById($customerId);
+                $previousCustomerData = $prevCustomerData->__toArray();
+                // phpcs:ignore Magento2.CodeAnalysis.EmptyBlock
+            } catch (NoSuchEntityException $e) {
+            }
+        }
+
+        $result = $proceed($customer);
+
+        if (!empty($previousCustomerData)
+            && $previousCustomerData['group_id'] !== null
+            && $previousCustomerData['group_id'] !== $customer->getGroupId()
+            && empty($previousCustomerData['taxvat'])) {
+            try {
+                $customerAccountShareScope = $this->scopeConfig->getValue(
+                    Share::XML_PATH_CUSTOMER_ACCOUNT_SHARE,
+                    ScopeConfigInterface::SCOPE_TYPE_DEFAULT
+                );
+                if ($customerAccountShareScope === Share::SHARE_WEBSITE) {
+                    /** @var Quote $quote */
+                    $quote = $this->cartRepository->getActiveForCustomer($customer->getId());
+                    if ($quote) {
+                        $quote->setCustomerGroupId($customer->getGroupId());
+                        $this->verifyPermission->verify($quote, $customer);
+                        $quote->collectTotals();
+                        $this->cartRepository->save($quote);
+                    }
+                } else {
+                    $this->collectTotalsForCustomer($customer);
+                }
+                // phpcs:ignore Magento2.CodeAnalysis.EmptyBlock
+            } catch (NoSuchEntityException $e) {
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Re-collect totals for customer group change
+     *
+     * @param Customer|AbstractModel $customer
+     * @return void
+     * @throws NoSuchEntityException
+     */
+    private function collectTotalsForCustomer(Customer|AbstractModel $customer): void
+    {
+        $allStores = $this->storeManager->getStores();
+        foreach ($allStores as $store) {
+            /** @var Quote $quote */
+            $quote = $this->cartRepository->getActiveForCustomer($customer->getId(), [$store->getId()]);
+            if ($quote) {
+                $this->verifyPermission->verify($quote, $customer);
+                $quote->collectTotals();
+                $this->cartRepository->save($quote);
+            }
+        }
+    }
+}
diff --git a/vendor/magento/module-catalog-permissions/Model/VerifyQuoteItemPermissionAfterGroupChange.php b/vendor/magento/module-catalog-permissions/Model/VerifyQuoteItemPermissionAfterGroupChange.php
new file mode 100644
index 00000000000..fb812c19b71
--- /dev/null
+++ b/vendor/magento/module-catalog-permissions/Model/VerifyQuoteItemPermissionAfterGroupChange.php
@@ -0,0 +1,156 @@
+<?php
+/**
+ * ADOBE CONFIDENTIAL
+ *
+ * Copyright 2026 Adobe
+ * All Rights Reserved.
+ *
+ * NOTICE: All information contained herein is, and remains
+ * the property of Adobe and its suppliers, if any. The intellectual
+ * and technical concepts contained herein are proprietary to Adobe
+ * and its suppliers and are protected by all applicable intellectual
+ * property laws, including trade secret and copyright laws.
+ * Dissemination of this information or reproduction of this material
+ * is strictly forbidden unless prior written permission is obtained
+ * from Adobe.
+ */
+declare(strict_types=1);
+
+namespace Magento\CatalogPermissions\Model;
+
+use Magento\CatalogPermissions\App\ConfigInterface;
+use Magento\CatalogPermissions\Model\Permission\Index;
+use Magento\Customer\Model\Customer;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Quote\Model\Quote;
+use Magento\Quote\Model\Quote\Item;
+use Magento\Store\Api\StoreRepositoryInterface;
+
+/**
+ * Verify quote items permission after customer group change
+ */
+class VerifyQuoteItemPermissionAfterGroupChange
+{
+    /**
+     * Initialize Constructor
+     *
+     * @param ConfigInterface $permissionsConfig
+     * @param Index $permissionIndex
+     * @param StoreRepositoryInterface $storeRepository
+     */
+    public function __construct(
+        private readonly ConfigInterface $permissionsConfig,
+        private readonly Index $permissionIndex,
+        private readonly StoreRepositoryInterface $storeRepository
+    ) {
+    }
+
+    /**
+     * Verify quote items permission after customer group change
+     *
+     * @param Quote $quote
+     * @param Customer $customer
+     * @throws NoSuchEntityException
+     * @SuppressWarnings(PHPMD.CyclomaticComplexity)
+     */
+    public function verify(Quote $quote, Customer $customer)
+    {
+        $storeId = $quote->getStoreId();
+        $customerGroupId = $customer->getGroupId();
+        $canCustomerAddToCart = $this->isConfigSettingsCanAddToCart($customerGroupId, $storeId);
+
+        if ($this->canCheckoutGeneralConfigPermissions($customerGroupId, $storeId) &&
+            $canCustomerAddToCart) {
+            return;
+        }
+
+        $websiteId = $this->storeRepository->getById($storeId)->getWebsiteId();
+        foreach ($quote->getAllItems() as $item) {
+            $categoryIds = $item->getProduct()->getCategoryIds();
+
+            if (empty($categoryIds)) {
+                $item->setDisableAddToCart(true);
+                continue;
+            }
+
+            $categoryPermissionIndex = $this->permissionIndex->getIndexForCategory(
+                $categoryIds,
+                $customerGroupId,
+                $websiteId
+            );
+            $permissions = [];
+            foreach ($categoryPermissionIndex as $permission) {
+                $permissions[] = (int)$permission['grant_checkout_items'];
+            }
+
+            if ((!empty($permissions) && !in_array(Permission::PERMISSION_ALLOW, $permissions, true)) ||
+                (!$canCustomerAddToCart && empty($permissions))) {
+                $item->setDisableAddToCart(true);
+            }
+        }
+        $this->verifyQuoteItems($quote);
+    }
+
+    /**
+     * Get Checkout Permissions from general config by Customer Group Id
+     *
+     * @param int $customerGroupId
+     * @param int $storeId
+     * @return bool
+     */
+    private function canCheckoutGeneralConfigPermissions(int $customerGroupId, int $storeId) : bool
+    {
+        if ((int)$this->permissionsConfig->getCheckoutItemsMode($storeId) === ConfigInterface::GRANT_CUSTOMER_GROUP) {
+            $grantCategoryView = in_array(
+                $customerGroupId,
+                $this->permissionsConfig->getCatalogCategoryViewGroups($storeId)
+            );
+        } else {
+            $viewMode = (int)$this->permissionsConfig->getCatalogCategoryViewMode($storeId);
+            $grantCategoryView = $viewMode === ConfigInterface::GRANT_ALL;
+        }
+
+        return $grantCategoryView;
+    }
+
+    /**
+     * Check if current customer group can add product to cart
+     *
+     * @param int $customerGroupId
+     * @param int $storeId
+     * @return bool
+     */
+    private function isConfigSettingsCanAddToCart(int $customerGroupId, int $storeId) : bool
+    {
+        $canAddToCart = true;
+        if ((int) $this->permissionsConfig->getCheckoutItemsMode($storeId) === ConfigInterface::GRANT_CUSTOMER_GROUP) {
+            $canAddToCart = in_array(
+                $customerGroupId,
+                $this->permissionsConfig->getCheckoutItemsGroups($storeId)
+            );
+        }
+        return $canAddToCart;
+    }
+
+    /**
+     * Verify quote items for customer
+     *
+     * @param Quote $quote
+     * @return void
+     */
+    private function verifyQuoteItems(Quote $quote): void
+    {
+        $allQuoteItems = $quote->getAllItems();
+        foreach ($allQuoteItems as $quoteItem) {
+            /** @var Item $quoteItem */
+            if ($quoteItem->getParentItem()) {
+                continue;
+            }
+
+            if ($quoteItem->getDisableAddToCart() && !$quoteItem->isDeleted()) {
+                $quote->removeItem($quoteItem->getQuoteId());
+                $quote->deleteItem($quoteItem);
+            }
+        }
+    }
+}
diff --git a/vendor/magento/module-catalog-permissions/Observer/CheckQuotePermissionsAfterCustomerLoginObserver.php b/vendor/magento/module-catalog-permissions/Observer/CheckQuotePermissionsAfterCustomerLoginObserver.php
new file mode 100644
index 00000000000..a617441b2f4
--- /dev/null
+++ b/vendor/magento/module-catalog-permissions/Observer/CheckQuotePermissionsAfterCustomerLoginObserver.php
@@ -0,0 +1,85 @@
+<?php
+/**
+ * ADOBE CONFIDENTIAL
+ *
+ * Copyright 2026 Adobe
+ * All Rights Reserved.
+ *
+ * NOTICE: All information contained herein is, and remains
+ * the property of Adobe and its suppliers, if any. The intellectual
+ * and technical concepts contained herein are proprietary to Adobe
+ * and its suppliers and are protected by all applicable intellectual
+ * property laws, including trade secret and copyright laws.
+ * Dissemination of this information or reproduction of this material
+ * is strictly forbidden unless prior written permission is obtained
+ * from Adobe.
+ */
+declare(strict_types=1);
+
+namespace Magento\CatalogPermissions\Observer;
+
+use Magento\CatalogPermissions\App\ConfigInterface;
+use Magento\CatalogPermissions\Model\VerifyQuoteItemPermissionAfterGroupChange;
+use Magento\Customer\Model\Session;
+use Magento\Framework\Event\Observer as EventObserver;
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Quote\Api\CartRepositoryInterface;
+use Magento\Framework\Event\ObserverInterface;
+
+/**
+ * Checks for permissions for quote items
+ *
+ * @SuppressWarnings(PHPMD.CookieAndSessionMisuse)
+ */
+class CheckQuotePermissionsAfterCustomerLoginObserver implements ObserverInterface
+{
+    /**
+     *
+     * @param ConfigInterface $permissionsConfig
+     * @param Session $customerSession
+     * @param CartRepositoryInterface $cartRepository
+     * @param VerifyQuoteItemPermissionAfterGroupChange $verifyPermission
+     */
+    public function __construct(
+        private readonly ConfigInterface $permissionsConfig,
+        private readonly Session $customerSession,
+        private readonly CartRepositoryInterface $cartRepository,
+        private readonly VerifyQuoteItemPermissionAfterGroupChange $verifyPermission
+    ) {
+    }
+
+    /**
+     * Checks permissions for all quote items for current active customer session
+     *
+     * @param EventObserver $observer
+     * @return $this
+     * @throws LocalizedException
+     * @throws NoSuchEntityException
+     *
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     * @SuppressWarnings(PHPMD.CyclomaticComplexity)
+     */
+    public function execute(EventObserver $observer)
+    {
+        if (!$this->permissionsConfig->isEnabled()) {
+            return $this;
+        }
+
+        $customer = $this->customerSession->getCustomer();
+        if (!$customer || !$customer->getId()) {
+            return $this;
+        }
+
+        $customerId = $customer->getId() ?: $customer->getEntityId();
+
+        $quote = $this->cartRepository->getActiveForCustomer($customerId) ?? null;
+
+        if ($quote) {
+            $this->verifyPermission->verify($quote, $customer);
+            $quote->collectTotals();
+            $this->cartRepository->save($quote);
+        }
+        return $this;
+    }
+}
diff --git a/vendor/magento/module-catalog-permissions/Observer/CheckQuotePermissionsObserver.php b/vendor/magento/module-catalog-permissions/Observer/CheckQuotePermissionsObserver.php
index 0a19732e98a..ff039d5e4b7 100644
--- a/vendor/magento/module-catalog-permissions/Observer/CheckQuotePermissionsObserver.php
+++ b/vendor/magento/module-catalog-permissions/Observer/CheckQuotePermissionsObserver.php
@@ -123,7 +123,11 @@ class CheckQuotePermissionsObserver implements ObserverInterface
     protected function _initPermissionsOnQuoteItems(Quote $quote)
     {
         $storeId = $quote->getStoreId();
-        $customerGroupId = $this->_customerSession->getCustomerGroupId();
+
+        $customer = $this->_customerSession->getCustomer();
+        $customerGroupId = ($customer && $customer->getId()) ?
+            (int)$customer->getGroupId() :
+            (int)$this->_customerSession->getCustomerGroupId();
         $canCustomerAddToCart = $this->isConfigSettingsCanAddToCart($customerGroupId, $storeId);
 
         if ($this->canCheckoutGeneralConfigPermissions($customerGroupId, $storeId) &&
diff --git a/vendor/magento/module-catalog-permissions/etc/adminhtml/di.xml b/vendor/magento/module-catalog-permissions/etc/adminhtml/di.xml
index 6133b54bbc0..74949517095 100644
--- a/vendor/magento/module-catalog-permissions/etc/adminhtml/di.xml
+++ b/vendor/magento/module-catalog-permissions/etc/adminhtml/di.xml
@@ -1,8 +1,19 @@
 <?xml version="1.0"?>
 <!--
 /**
- * Copyright © Magento, Inc. All rights reserved.
- * See COPYING.txt for license details.
+ * ADOBE CONFIDENTIAL
+ *
+ * Copyright 2014 Adobe
+ * All Rights Reserved.
+ *
+ * NOTICE: All information contained herein is, and remains
+ * the property of Adobe and its suppliers, if any. The intellectual
+ * and technical concepts contained herein are proprietary to Adobe
+ * and its suppliers and are protected by all applicable intellectual
+ * property laws, including trade secret and copyright laws.
+ * Dissemination of this information or reproduction of this material
+ * is strictly forbidden unless prior written permission is obtained
+ * from Adobe.
  */
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
@@ -10,4 +21,7 @@
     <type name="Magento\Catalog\Model\Category\DataProvider">
         <plugin name="catalog_permissions_category_data_provider" type="Magento\CatalogPermissions\Model\Plugin\Catalog\Category\DataProvider" />
     </type>
+    <type name="Magento\Customer\Model\ResourceModel\Customer">
+        <plugin name="recollect_quote_with_catalog_permission" type="Magento\CatalogPermissions\Model\Plugin\RecollectQuoteWithCatalogPermission"/>
+    </type>
 </config>
diff --git a/vendor/magento/module-catalog-permissions/etc/frontend/events.xml b/vendor/magento/module-catalog-permissions/etc/frontend/events.xml
index cc1de1319ff..9ed9d1e7c11 100644
--- a/vendor/magento/module-catalog-permissions/etc/frontend/events.xml
+++ b/vendor/magento/module-catalog-permissions/etc/frontend/events.xml
@@ -1,8 +1,19 @@
 <?xml version="1.0"?>
 <!--
 /**
- * Copyright © Magento, Inc. All rights reserved.
- * See COPYING.txt for license details.
+ * ADOBE CONFIDENTIAL
+ *
+ * Copyright 2014 Adobe
+ * All Rights Reserved.
+ *
+ * NOTICE: All information contained herein is, and remains
+ * the property of Adobe and its suppliers, if any. The intellectual
+ * and technical concepts contained herein are proprietary to Adobe
+ * and its suppliers and are protected by all applicable intellectual
+ * property laws, including trade secret and copyright laws.
+ * Dissemination of this information or reproduction of this material
+ * is strictly forbidden unless prior written permission is obtained
+ * from Adobe.
  */
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
@@ -60,4 +71,7 @@
     <event name="rss_catalog_category_xml_callback">
         <observer name="magento_catalogpermissions" instance="Magento\CatalogPermissions\Observer\CheckIfProductAllowedInRssObserver"/>
     </event>
+    <event name="customer_login">
+        <observer name="magento_catalogpermissions" instance="Magento\CatalogPermissions\Observer\CheckQuotePermissionsAfterCustomerLoginObserver"/>
+    </event>
 </config>