The crayon-syntax-highlighter plugin before 2.8.4 for WordPress has multiple XSS issues via AJAX requests.
https://wordpress.org/plugins/crayon-syntax-highlighter/#developers
https://github.com/aramk/crayon-syntax-highlighter/issues/347
https://github.com/aramk/crayon-syntax-highlighter/commit/7fdb2e6b4c65178b4ed01ff08a8a38afe5a5151e