The Kwayy HTML Sitemap WordPress plugin before 4.0 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).
https://wpscan.com/vulnerability/514ffd28-f2c2-4c95-87b5-d05ce0746f89