The Customer Service Software & Support Ticket System WordPress plugin before 5.10.4 does not sanitize or escape form fields before outputting it in the List, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.
https://wpscan.com/vulnerability/41a2c72c-7db1-473a-8844-47f6ae9d0594