diff --git a/app/code/Magento/Customer/Block/Account/AuthenticationPopup.php b/app/code/Magento/Customer/Block/Account/AuthenticationPopup.php
index a0f94e1b8f733..eefec4c35679c 100644
--- a/app/code/Magento/Customer/Block/Account/AuthenticationPopup.php
+++ b/app/code/Magento/Customer/Block/Account/AuthenticationPopup.php
@@ -15,16 +15,26 @@ class AuthenticationPopup extends \Magento\Framework\View\Element\Template
      */
     protected $jsLayout;
 
+    /**
+     * @var \Magento\Framework\Serialize\Serializer\Json
+     */
+    private $serializer;
+
     /**
      * @param \Magento\Framework\View\Element\Template\Context $context
      * @param array $data
+     * @param \Magento\Framework\Serialize\Serializer\Json|null $serializer
+     * @throws \RuntimeException
      */
     public function __construct(
         \Magento\Framework\View\Element\Template\Context $context,
-        array $data = []
+        array $data = [],
+        \Magento\Framework\Serialize\Serializer\Json $serializer = null
     ) {
         parent::__construct($context, $data);
         $this->jsLayout = isset($data['jsLayout']) && is_array($data['jsLayout']) ? $data['jsLayout'] : [];
+        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
+            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
     }
 
     /**
@@ -32,7 +42,7 @@ public function __construct(
      */
     public function getJsLayout()
     {
-        return \Zend_Json::encode($this->jsLayout);
+        return $this->serializer->serialize($this->jsLayout);
     }
 
     /**
@@ -50,6 +60,18 @@ public function getConfig()
         ];
     }
 
+    /**
+     * Returns popup config in JSON format.
+     *
+     * Added in scope of https://github.com/magento/magento2/pull/8617
+     *
+     * @return bool|string
+     */
+    public function getSerializedConfig()
+    {
+        return $this->serializer->serialize($this->getConfig());
+    }
+
     /**
      * Is autocomplete enabled for storefront
      *
diff --git a/app/code/Magento/Customer/Test/Unit/Block/Account/AuthenticationPopupTest.php b/app/code/Magento/Customer/Test/Unit/Block/Account/AuthenticationPopupTest.php
index 67a3fb8f3a576..40f770ab9fbd4 100644
--- a/app/code/Magento/Customer/Test/Unit/Block/Account/AuthenticationPopupTest.php
+++ b/app/code/Magento/Customer/Test/Unit/Block/Account/AuthenticationPopupTest.php
@@ -31,6 +31,9 @@ class AuthenticationPopupTest extends \PHPUnit_Framework_TestCase
     /** @var UrlInterface|\PHPUnit_Framework_MockObject_MockObject */
     private $urlBuilderMock;
 
+    /** @var \Magento\Framework\Serialize\Serializer\Json|\PHPUnit_Framework_MockObject_MockObject */
+    private $serializerMock;
+
     protected function setUp()
     {
         $this->contextMock = $this->getMockBuilder(Context::class)
@@ -72,8 +75,13 @@ function ($string) {
             ->method('getEscaper')
             ->willReturn($escaperMock);
 
+        $this->serializerMock = $this->getMockBuilder(\Magento\Framework\Serialize\Serializer\Json::class)
+            ->getMock();
+
         $this->model = new AuthenticationPopup(
-            $this->contextMock
+            $this->contextMock,
+            [],
+            $this->serializerMock
         );
     }
 
@@ -83,6 +91,7 @@ function ($string) {
      * @param string $registerUrl
      * @param string $forgotUrl
      * @param array $result
+     * @throws \PHPUnit_Framework_Exception
      *
      * @dataProvider dataProviderGetConfig
      */
@@ -172,4 +181,51 @@ public function dataProviderGetConfig()
             ],
         ];
     }
+
+    /**
+     * @param mixed $isAutocomplete
+     * @param string $baseUrl
+     * @param string $registerUrl
+     * @param string $forgotUrl
+     * @param array $result
+     * @throws \PHPUnit_Framework_Exception
+     *
+     * @dataProvider dataProviderGetConfig
+     */
+    public function testGetSerializedConfig($isAutocomplete, $baseUrl, $registerUrl, $forgotUrl, array $result)
+    {
+        $this->scopeConfigMock->expects($this->any())
+            ->method('getValue')
+            ->with(Form::XML_PATH_ENABLE_AUTOCOMPLETE, ScopeInterface::SCOPE_STORE, null)
+            ->willReturn($isAutocomplete);
+
+        /** @var StoreInterface||\PHPUnit_Framework_MockObject_MockObject $storeMock */
+        $storeMock = $this->getMockBuilder(StoreInterface::class)
+            ->setMethods(['getBaseUrl'])
+            ->getMockForAbstractClass();
+
+        $this->storeManagerMock->expects($this->any())
+            ->method('getStore')
+            ->with(null)
+            ->willReturn($storeMock);
+
+        $storeMock->expects($this->any())
+            ->method('getBaseUrl')
+            ->willReturn($baseUrl);
+
+        $this->urlBuilderMock->expects($this->any())
+            ->method('getUrl')
+            ->willReturnMap(
+                [
+                    ['customer/account/create', [], $registerUrl],
+                    ['customer/account/forgotpassword', [], $forgotUrl],
+                ]
+            );
+        $this->serializerMock->expects($this->any())->method('serialize')
+            ->willReturn(
+                json_encode($this->model->getConfig())
+            );
+
+        $this->assertEquals(json_encode($result), $this->model->getSerializedConfig());
+    }
 }
diff --git a/app/code/Magento/Customer/view/frontend/templates/account/authentication-popup.phtml b/app/code/Magento/Customer/view/frontend/templates/account/authentication-popup.phtml
index bcf0cc92bc912..20ea488931398 100644
--- a/app/code/Magento/Customer/view/frontend/templates/account/authentication-popup.phtml
+++ b/app/code/Magento/Customer/view/frontend/templates/account/authentication-popup.phtml
@@ -10,7 +10,7 @@
 ?>
 <div id="authenticationPopup" data-bind="scope:'authenticationPopup'" style="display: none;">
     <script>
-        window.authenticationPopup = <?php /* @noEscape */ echo \Zend_Json::encode($block->getConfig()); ?>;
+        window.authenticationPopup = <?php /* @noEscape */ echo $block->getSerializedConfig(); ?>;
     </script>
     <!-- ko template: getTemplate() --><!-- /ko -->
     <script type="text/x-magento-init">