fixed security issue

git-svn-id: https://plugins.svn.wordpress.org/page-layout-builder/trunk@974815 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed security issue.

git-svn-id: https://plugins.svn.wordpress.org/page-layout-builder/trunk@974819 b8457f37-d9ea-0310-8a92-e5e31aec5664