The SupportCandy WordPress plugin before 2.2.7 does not have CSRF check in the wpsc_tickets AJAX action, nor has any sanitisation or escaping in some of the filter fields which could allow attackers to make a logged in user having access to the ticket lists dashboard set an arbitrary filter (stored in their cookies) with an XSS payload in it.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-24879
• https://wpscan.com/vulnerability/6dfb4f61-c8cb-40ad-812f-139482be0fb4