The Font Farsi WordPress plugin through 1.6.6 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/7c87fcd2-6ffd-4285-bbf5-36efea70b620/