CVE-2023-45819

TinyMCE is an open source rich text editor. A cross-site scripting (XSS)
vulnerability was discovered in TinyMCE’s Notification Manager API. The
vulnerability exploits TinyMCE’s unfiltered notification system, which is
used in error handling. The conditions for this exploit requires carefully
crafted malicious content to have been inserted into the editor and a
notification to have been triggered. When a notification was opened, the
HTML within the text argument was displayed unfiltered in the notification.
The vulnerability allowed arbitrary JavaScript execution when an
notification presented in the TinyMCE UI for the current user. This issue
could also be exploited by any integration which uses a TinyMCE
notification to display unfiltered HTML content. This vulnerability has
been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by ensuring that the HTML
displayed in the notification is sanitized, preventing the exploit. Users
are advised to upgrade. There are no known workarounds for this
vulnerability.