CVE-2022-23494

tinymce is an open source rich text editor. A cross-site scripting (XSS)
vulnerability was discovered in the alert and confirm dialogs when these
dialogs were provided with malicious HTML content. This can occur in
plugins that use the alert or confirm dialogs, such as in the image
plugin, which presents these dialogs when certain errors occur. The
vulnerability allowed arbitrary JavaScript execution when an alert
presented in the TinyMCE UI for the current user. This vulnerability has
been patched in TinyMCE 5.10.7 and TinyMCE 6.3.1 by ensuring HTML
sanitization was still performed after unwrapping invalid elements. Users
are advised to upgrade to either 5.10.7 or 6.3.1. Users unable to upgrade
may ensure the the images_upload_handler returns a valid value as per the
images_upload_handler documentation.