diff --git a/vendor/magento/module-quote/Model/QuoteRepository.php b/vendor/magento/module-quote/Model/QuoteRepository.php
index c836578bcc2..db5d1a551a4 100644
--- a/vendor/magento/module-quote/Model/QuoteRepository.php
+++ b/vendor/magento/module-quote/Model/QuoteRepository.php
@@ -12,6 +12,7 @@ use Magento\Framework\Api\SearchCriteria\CollectionProcessor;
 use Magento\Framework\Api\SearchCriteria\CollectionProcessorInterface;
 use Magento\Framework\Api\SearchCriteriaInterface;
 use Magento\Framework\App\ObjectManager;
+use Magento\Framework\App\RequestSafetyInterface;
 use Magento\Framework\Exception\InputException;
 use Magento\Framework\Exception\NoSuchEntityException;
 use Magento\Framework\ObjectManager\ResetAfterRequestInterface;
@@ -96,6 +97,11 @@ class QuoteRepository implements CartRepositoryInterface, ResetAfterRequestInter
      */
     private $cartFactory;
 
+    /**
+     * @var RequestSafetyInterface
+     */
+    private $requestSafety;
+
     /**
      * Constructor
      *
@@ -107,6 +113,7 @@ class QuoteRepository implements CartRepositoryInterface, ResetAfterRequestInter
      * @param CollectionProcessorInterface|null $collectionProcessor
      * @param QuoteCollectionFactory|null $quoteCollectionFactory
      * @param CartInterfaceFactory|null $cartFactory
+     * @param RequestSafetyInterface|null $requestSafety
      * @SuppressWarnings(PHPMD.UnusedFormalParameter)
      */
     public function __construct(
@@ -117,7 +124,8 @@ class QuoteRepository implements CartRepositoryInterface, ResetAfterRequestInter
         JoinProcessorInterface $extensionAttributesJoinProcessor,
         CollectionProcessorInterface $collectionProcessor = null,
         QuoteCollectionFactory $quoteCollectionFactory = null,
-        CartInterfaceFactory $cartFactory = null
+        CartInterfaceFactory $cartFactory = null,
+        RequestSafetyInterface $requestSafety = null
     ) {
         $this->quoteFactory = $quoteFactory;
         $this->storeManager = $storeManager;
@@ -128,6 +136,7 @@ class QuoteRepository implements CartRepositoryInterface, ResetAfterRequestInter
         $this->quoteCollectionFactory = $quoteCollectionFactory ?: ObjectManager::getInstance()
             ->get(QuoteCollectionFactory::class);
         $this->cartFactory = $cartFactory ?: ObjectManager::getInstance()->get(CartInterfaceFactory::class);
+        $this->requestSafety = $requestSafety ?: ObjectManager::getInstance()->get(RequestSafetyInterface::class);
     }
 
     /**
@@ -178,6 +187,7 @@ class QuoteRepository implements CartRepositoryInterface, ResetAfterRequestInter
      */
     public function getActive($cartId, array $sharedStoreIds = [])
     {
+        $this->validateCachedActiveQuote((int)$cartId);
         $quote = $this->get($cartId, $sharedStoreIds);
         if (!$quote->getIsActive()) {
             throw NoSuchEntityException::singleField('cartId', $cartId);
@@ -185,11 +195,33 @@ class QuoteRepository implements CartRepositoryInterface, ResetAfterRequestInter
         return $quote;
     }
 
+    /**
+     * Validates if cached quote is still active.
+     *
+     * @param int $cartId
+     * @return void
+     * @throws NoSuchEntityException
+     */
+    private function validateCachedActiveQuote(int $cartId): void
+    {
+        if (isset($this->quotesById[$cartId]) && !$this->requestSafety->isSafeMethod()) {
+            $quote = $this->cartFactory->create();
+            if (is_callable([$quote, 'setSharedStoreIds'])) {
+                $quote->setSharedStoreIds(['*']);
+            }
+            $quote->loadActive($cartId);
+            if (!$quote->getIsActive()) {
+                throw NoSuchEntityException::singleField('cartId', $cartId);
+            }
+        }
+    }
+
     /**
      * @inheritdoc
      */
     public function getActiveForCustomer($customerId, array $sharedStoreIds = [])
     {
+        $this->validateCachedCustomerActiveQuote((int)$customerId);
         $quote = $this->getForCustomer($customerId, $sharedStoreIds);
         if (!$quote->getIsActive()) {
             throw NoSuchEntityException::singleField('customerId', $customerId);
@@ -197,6 +229,28 @@ class QuoteRepository implements CartRepositoryInterface, ResetAfterRequestInter
         return $quote;
     }
 
+    /**
+     * Validates if cached customer quote is still active.
+     *
+     * @param int $customerId
+     * @return void
+     * @throws NoSuchEntityException
+     */
+    private function validateCachedCustomerActiveQuote(int $customerId): void
+    {
+        if (isset($this->quotesByCustomerId[$customerId]) && !$this->requestSafety->isSafeMethod()) {
+            $quoteId = $this->quotesByCustomerId[$customerId]->getId();
+            $quote = $this->cartFactory->create();
+            if (is_callable([$quote, 'setSharedStoreIds'])) {
+                $quote->setSharedStoreIds(['*']);
+            }
+            $quote->loadActive($quoteId);
+            if (!$quote->getIsActive()) {
+                throw NoSuchEntityException::singleField('customerId', $customerId);
+            }
+        }
+    }
+
     /**
      * @inheritdoc
      */
diff --git a/vendor/magento/module-quote/i18n/en_US.csv b/vendor/magento/module-quote/i18n/en_US.csv
index 6563651ba5a..65c12c26fc6 100644
--- a/vendor/magento/module-quote/i18n/en_US.csv
+++ b/vendor/magento/module-quote/i18n/en_US.csv
@@ -69,6 +69,7 @@ Carts,Carts
 "Validated Country Code","Validated Country Code"
 "Validated Vat Number","Validated Vat Number"
 "Invalid Quote Item id %1","Invalid Quote Item id %1"
+"The cart is locked for processing. Please try again later.","The cart is locked for processing. Please try again later."
 "Invalid quote address id %1","Invalid quote address id %1"
 "Number above 0 is required for the limit","Number above 0 is required for the limit"
 "Please select a valid rate limit period in seconds: %1.","Please select a valid rate limit period in seconds: %1."