NewFolder.php

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<?php
namespace Magento\Cms\Controller\Adminhtml\Wysiwyg\Images;

use Magento\Framework\App\Filesystem\DirectoryList;

class NewFolder extends \Magento\Cms\Controller\Adminhtml\Wysiwyg\Images
{
    protected $resultJsonFactory;

    private $directoryResolver;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory,
        \Magento\Framework\App\Filesystem\DirectoryResolver $directoryResolver = null
    ) {
        parent::__construct($context, $coreRegistry);
        $this->resultJsonFactory = $resultJsonFactory;
        $this->directoryResolver = $directoryResolver
            ?: $this->_objectManager->get(\Magento\Framework\App\Filesystem\DirectoryResolver::class);
    }

    public function execute()
    {
        try {
            $this->_initAction();
            $name = $this->getRequest()->getPost('name');
            $path = $this->getStorage()->getSession()->getCurrentPath();
            if (!$this->directoryResolver->validatePath($path, DirectoryList::MEDIA)) {
                throw new \Magento\Framework\Exception\LocalizedException(
                    __('Directory %1 is not under storage root path.', $path)
                );
            }
            $result = $this->getStorage()->createDirectory($name, $path);
        } catch (\Exception $e) {
            $result = ['error' => true, 'message' => $e->getMessage()];
        }
        $resultJson = $this->resultJsonFactory->create();
        
        return $resultJson->setData($result);
    }
}