magento-test/app/code/Magento/Cms/etc/webapi_rest/di.xml

<?xml version="1.0" ?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Cms\Api\PageRepositoryInterface">
        <plugin name="aclCheck" type="Magento\Cms\Observer\PageAclPlugin" sortOrder="100" />
    </type>
</config>