The Support Board WordPress plugin before 3.3.5 allows Authenticated (Agent+) users to perform Cross-Site Scripting attacks by placing a payload in the notes field, when an administrator or any authenticated user go to the chat the XSS will be automatically executed.
https://wpscan.com/vulnerability/19d101aa-4b60-4db4-a33b-86c826b288b0
https://medium.com/%40lijohnjefferson/cve-2021-24807-6bc22af2a444