diff --git a/spec/Validator/InStockWishlistValidatorSpec.php b/spec/Validator/InStockWishlistValidatorSpec.php
new file mode 100644
index 00000000..d3f529ce
--- /dev/null
+++ b/spec/Validator/InStockWishlistValidatorSpec.php
@@ -0,0 +1,176 @@
+<?php
+
+/*
+ * This file has been created by developers from BitBag.
+ * Feel free to contact us once you face any issues or want to start
+ * You can find more information about us on https://bitbag.io and write us
+ * an email on hello@bitbag.io.
+ */
+
+declare(strict_types=1);
+
+namespace spec\BitBag\SyliusWishlistPlugin\Validator;
+
+use BitBag\SyliusWishlistPlugin\Validator\InStockWishlistValidator;
+use Doctrine\Common\Collections\ArrayCollection;
+use PhpSpec\ObjectBehavior;
+use Prophecy\Argument;
+use stdClass;
+use Sylius\Bundle\CoreBundle\Validator\Constraints\CartItemAvailability;
+use Sylius\Bundle\OrderBundle\Controller\AddToCartCommandInterface;
+use Sylius\Component\Core\Model\OrderItemInterface;
+use Sylius\Component\Core\Model\ProductVariantInterface;
+use Sylius\Component\Inventory\Checker\AvailabilityCheckerInterface;
+use Sylius\Component\Order\Model\OrderInterface;
+use Symfony\Bundle\FrameworkBundle\Routing\Router;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\Context\ExecutionContextInterface;
+
+final class InStockWishlistValidatorSpec extends ObjectBehavior
+{
+    public function let(
+        AvailabilityCheckerInterface $availabilityChecker,
+        RequestStack $requestStack,
+        Router $router,
+    ): void {
+        $this->beConstructedWith($availabilityChecker, $requestStack, $router);
+    }
+
+    public function it_is_initializable(): void
+    {
+        $this->shouldHaveType(InStockWishlistValidator::class);
+    }
+
+    public function it_should_throw_exception_if_value_is_not_instance_of_command_interface(
+        Constraint $constraint,
+        stdClass $value,
+    ): void {
+        $this->shouldThrow(\Exception::class)->during(
+            'validate',
+            [$value, $constraint],
+        );
+    }
+
+    public function it_should_throw_exception_if_constraint_is_not_instance_of_command_interface(
+        Constraint $constraint,
+        AddToCartCommandInterface $value,
+    ): void {
+        $this->shouldThrow(\Exception::class)->during(
+            'validate',
+            [$value, $constraint],
+        );
+    }
+
+    public function it_should_throw_exception_if_request_is_null(
+        RequestStack $requestStack,
+        AddToCartCommandInterface $value,
+    ): void {
+        $constraint = new CartItemAvailability();
+
+        $requestStack->getCurrentRequest()->willReturn(null);
+
+        $this->shouldThrow(\Exception::class)->during(
+            'validate',
+            [$value, $constraint],
+        );
+    }
+
+    public function it_should_do_nothing_if_the_request_is_not_add_to_cart(
+        RequestStack $requestStack,
+        AddToCartCommandInterface $value,
+        Request $request,
+        Router $router,
+    ): void {
+        $constraint = new CartItemAvailability();
+        $exampleArray = [
+            '_route' => 'bitbag_sylius_wishlist_plugin_shop_locale_wishlist_remove_selected_products',
+            '_controller' => 'bitbag_sylius_wishlist_plugin.controller.action.remove_selected_products_from_wishlist',
+            '_locale' => 'en_US',
+            'wishlistId' => '4',
+        ];
+
+        $requestStack->getCurrentRequest()->willReturn($request);
+        $request->getPathInfo()->willReturn('/en_US/wishlist/4/products/delete');
+        $router->match('/en_US/wishlist/4/products/delete')->willReturn($exampleArray);
+
+        $this->validate($value, $constraint)->shouldReturn(null);
+    }
+
+    public function it_should_do_nothing_if_current_stock_is_not_empty(
+        AvailabilityCheckerInterface $availabilityChecker,
+        RequestStack $requestStack,
+        AddToCartCommandInterface $value,
+        Request $request,
+        Router $router,
+        OrderItemInterface $cartItem,
+        ExecutionContextInterface $context,
+        ProductVariantInterface $variant,
+        OrderInterface $order,
+    ): void {
+        $constraint = new CartItemAvailability();
+        $exampleArray = ['_route' => 'bitbag_sylius_wishlist_plugin_shop_locale_wishlist_add_selected_products',
+            '_controller' => 'bitbag_sylius_wishlist_plugin.controller.action.add_selected_products_to_cart',
+            '_locale' => 'en_US',
+            'wishlistId' => '4',
+        ];
+
+        $requestStack->getCurrentRequest()->willReturn($request);
+        $request->getPathInfo()->willReturn('/en_US/wishlist/4/products/add');
+        $router->match('/en_US/wishlist/4/products/add')->willReturn($exampleArray);
+        $value->getCartItem()->willReturn($cartItem);
+        $cartItem->getVariant()->willReturn($variant);
+        $cartItem->getQuantity()->willReturn(5);
+        $value->getCart()->willReturn($order);
+        $itemsCollection = new ArrayCollection([$cartItem->getWrappedObject()]);
+        $order->getItems()->willReturn($itemsCollection);
+        $cartItem->equals(Argument::any())->willReturn(false);
+        $availabilityChecker->isStockSufficient($variant, 5)->willReturn(true);
+
+        $context->addViolation(Argument::any(), Argument::any())->shouldNotBeCalled();
+
+        $this->validate($value, $constraint)->shouldReturn(null);
+    }
+
+    public function it_should_do_build_violation_if_current_stock_is_empty_and_user_added_to_cart_item_from_wishlist(
+        AvailabilityCheckerInterface $availabilityChecker,
+        RequestStack $requestStack,
+        AddToCartCommandInterface $value,
+        Request $request,
+        Router $router,
+        OrderItemInterface $cartItem,
+        OrderInterface $order,
+        ProductVariantInterface $variant,
+        ExecutionContextInterface $context,
+    ): void {
+        $constraint = new CartItemAvailability();
+        $constraint->message = 'sylius.cart_item.not_available';
+        $exampleArray = ['_route' => 'bitbag_sylius_wishlist_plugin_shop_locale_wishlist_add_selected_products',
+            '_controller' => 'bitbag_sylius_wishlist_plugin.controller.action.add_selected_products_to_cart',
+            '_locale' => 'en_US',
+            'wishlistId' => '4',
+        ];
+
+        $requestStack->getCurrentRequest()->willReturn($request);
+        $request->getPathInfo()->willReturn('/en_US/wishlist/4/products/add');
+        $router->match('/en_US/wishlist/4/products/add')->willReturn($exampleArray);
+        $value->getCartItem()->willReturn($cartItem);
+        $cartItem->getVariant()->willReturn($variant);
+        $cartItem->getQuantity()->willReturn(5);
+        $value->getCart()->willReturn($order);
+        $itemsCollection = new ArrayCollection([$cartItem->getWrappedObject()]);
+        $order->getItems()->willReturn($itemsCollection);
+        $cartItem->equals(Argument::any())->willReturn(false);
+        $availabilityChecker->isStockSufficient($variant, 5)->willReturn(false);
+        $variant->getInventoryName()->willReturn('Red T-shirt');
+
+        $context->addViolation(
+            $constraint->message,
+            ['%itemName%' => 'Red T-shirt'],
+        )->shouldBeCalled();
+
+        $this->initialize($context);
+        $this->validate($value, $constraint);
+    }
+}
diff --git a/src/Resources/config/services/validator.xml b/src/Resources/config/services/validator.xml
new file mode 100644
index 00000000..ea329c06
--- /dev/null
+++ b/src/Resources/config/services/validator.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<container xmlns="http://symfony.com/schema/dic/services"
+           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+           xsi:schemaLocation="http://symfony.com/schema/dic/services
+               http://symfony.com/schema/dic/services/services-1.0.xsd">
+
+    <services>
+        <service class="BitBag\SyliusWishlistPlugin\Validator\InStockWishlistValidator"
+                 id="bitbag.sylius_wishlist_plugin.validator.wishlist_in_stock_validator"
+                 decorates="sylius.validator.cart_item_availability">
+            <argument type="service" id="sylius.availability_checker.default" />
+            <argument type="service" id="request_stack" />
+            <argument type="service" id="router" />
+            <tag name="validator.constraint_validator" alias="bitbag_sylius_wishlist_plugin_validator_wishlist_in_stock_validator"/>
+        </service>
+    </services>
+
+</container>
diff --git a/src/Resources/config/validation/AddToCartCommand.xml b/src/Resources/config/validation/AddToCartCommand.xml
new file mode 100644
index 00000000..7369f259
--- /dev/null
+++ b/src/Resources/config/validation/AddToCartCommand.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping http://symfony.com/schema/dic/services/constraint-mapping-1.0.xsd">
+    <class name="Sylius\Bundle\OrderBundle\Controller\AddToCartCommand">
+        <constraint name="BitBag\SyliusWishlistPlugin\Validator\Constraints\InStockWishlistConstraint">
+            <option name="message">sylius.cart_item.not_available</option>
+            <option name="groups">
+                <value>wishlist_in_stock</value>
+            </option>
+        </constraint>
+    </class>
+</constraint-mapping>
diff --git a/src/Validator/Constraints/InStockWishlistConstraint.php b/src/Validator/Constraints/InStockWishlistConstraint.php
new file mode 100644
index 00000000..3e57c7b7
--- /dev/null
+++ b/src/Validator/Constraints/InStockWishlistConstraint.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file has been created by developers from BitBag.
+ * Feel free to contact us once you face any issues or want to start
+ * You can find more information about us on https://bitbag.io and write us
+ * an email on hello@bitbag.io.
+ */
+
+declare(strict_types=1);
+
+namespace BitBag\SyliusWishlistPlugin\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+
+final class InStockWishlistConstraint extends Constraint
+{
+    public string $message = 'sylius.cart_item.not_available';
+
+    public const ADD_PRODUCTS_ROUTE = 'bitbag_sylius_wishlist_plugin_shop_locale_wishlist_add_selected_products';
+
+    public function validatedBy(): string
+    {
+        return 'bitbag_sylius_wishlist_plugin_validator_wishlist_in_stock_validator';
+    }
+
+    public function getTargets(): string
+    {
+        return self::CLASS_CONSTRAINT;
+    }
+}
diff --git a/src/Validator/InStockWishlistValidator.php b/src/Validator/InStockWishlistValidator.php
new file mode 100644
index 00000000..3e107ec7
--- /dev/null
+++ b/src/Validator/InStockWishlistValidator.php
@@ -0,0 +1,88 @@
+<?php
+
+/*
+ * This file has been created by developers from BitBag.
+ * Feel free to contact us once you face any issues or want to start
+ * You can find more information about us on https://bitbag.io and write us
+ * an email on hello@bitbag.io.
+ */
+
+declare(strict_types=1);
+
+namespace BitBag\SyliusWishlistPlugin\Validator;
+
+use BitBag\SyliusWishlistPlugin\Validator\Constraints\InStockWishlistConstraint;
+use Sylius\Bundle\CoreBundle\Validator\Constraints\CartItemAvailability;
+use Sylius\Bundle\OrderBundle\Controller\AddToCartCommandInterface;
+use Sylius\Component\Core\Model\OrderItemInterface;
+use Sylius\Component\Inventory\Checker\AvailabilityCheckerInterface;
+use Sylius\Component\Inventory\Model\StockableInterface;
+use Sylius\Component\Order\Model\OrderInterface;
+use Symfony\Bundle\FrameworkBundle\Routing\Router;
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\Routing\Exception\ResourceNotFoundException;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Webmozart\Assert\Assert;
+
+final class InStockWishlistValidator extends ConstraintValidator
+{
+    public function __construct(
+        private AvailabilityCheckerInterface $availabilityChecker,
+        private RequestStack $requestStack,
+        private Router $router,
+    ) {
+    }
+
+    public function validate(mixed $value, Constraint $constraint): void
+    {
+        Assert::isInstanceOf($value, AddToCartCommandInterface::class);
+
+        Assert::isInstanceOf($constraint, CartItemAvailability::class);
+
+        $request = $this->requestStack->getCurrentRequest();
+
+        Assert::notNull($request);
+
+        try {
+            $route = $this->router->match($request->getPathInfo());
+        } catch (ResourceNotFoundException $exception) {
+            throw new AccessDeniedHttpException('Access denied');
+        }
+
+        if (array_key_exists('_route', $route) &&
+            InStockWishlistConstraint::ADD_PRODUCTS_ROUTE !== $route['_route']) {
+            return;
+        }
+
+        /** @var OrderItemInterface $cartItem */
+        $cartItem = $value->getCartItem();
+
+        /** @var StockableInterface $variant */
+        $variant = $cartItem->getVariant();
+
+        $isStockSufficient = $this->availabilityChecker->isStockSufficient(
+            $variant,
+            $cartItem->getQuantity() + $this->getExistingCartItemQuantityFromCart($value->getCart(), $cartItem),
+        );
+
+        if (!$isStockSufficient) {
+            $this->context->addViolation(
+                $constraint->message,
+                ['%itemName%' => $variant->getInventoryName()],
+            );
+        }
+    }
+
+    private function getExistingCartItemQuantityFromCart(OrderInterface $cart, OrderItemInterface $cartItem): int
+    {
+        foreach ($cart->getItems() as $existingCartItem) {
+            if ($existingCartItem->equals($cartItem)) {
+                return $existingCartItem->getQuantity();
+            }
+        }
+
+        return 0;
+    }
+}