CVE-2023-48219

TinyMCE is an open source rich text editor. A mutation cross-site scripting
(mXSS) vulnerability was discovered in TinyMCE’s core undo/redo
functionality and other APIs and plugins. Text nodes within specific
parents are not escaped upon serialization according to the HTML standard.
If such text nodes contain a special character reserved as an internal
marker, they can be combined with other HTML patterns to form malicious
snippets. These snippets pass the initial sanitisation layer when the
content is parsed into the editor body, but can trigger XSS when the
special internal marker is removed from the content and re-parsed. his
vulnerability has been patched in TinyMCE versions 6.7.3 and 5.10.9. Users
are advised to upgrade. There are no known workarounds for this
vulnerability.