The wccp-pro WordPress plugin before 15.3 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/2b1af7eb-452a-43f4-aae9-edd8e7312fe8/