Thumbnail.php

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

use Magento\Backend\App\Action;

class Thumbnail extends \Magento\Cms\Controller\Adminhtml\Wysiwyg\Images
{
    protected $resultRawFactory;

    public function __construct(
        Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Framework\Controller\Result\RawFactory $resultRawFactory
    ) {
        $this->resultRawFactory = $resultRawFactory;
        parent::__construct($context, $coreRegistry);
    }

    public function execute()
    {
        $file = $this->getRequest()->getParam('file');
        $file = $this->_objectManager->get(\Magento\Cms\Helper\Wysiwyg\Images::class)->idDecode($file);
        $thumb = $this->getStorage()->resizeOnTheFly($file);
        $resultRaw = $this->resultRawFactory->create();
        if ($thumb !== false) {
            $image = $this->_objectManager->get(\Magento\Framework\Image\AdapterFactory::class)->create();
            $image->open($thumb);
            $resultRaw->setHeader('Content-Type', $image->getMimeType());
            $resultRaw->setContents($image->getImage());
            return $resultRaw;
        } else {
            // todo: generate some placeholder
        }
    }
}