Vulnerability CVE-2021-24208

The editor of the WP Page Builder WordPress plugin before 1.2.4 allows lower-privileged users to insert unfiltered HTML, including JavaScript, into pages via the ??Raw HTML? widget and the ??Custom HTML? widgets (though the custom HTML widget requires sending a crafted request - it appears that this widget uses some form of client side validation but not server side validation), all of which are added via the ??page_builder_data? parameter when performing the ??wppb_page_save? AJAX action. It is also possible to insert malicious JavaScript via the ??wppb_page_css? parameter (this can be done by closing out the style tag and opening a script tag) when performing the ??wppb_page_save? AJAX action.