The Top Bar WordPress plugin before 3.0.5 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/5bd16f84-22bf-4170-b65c-08caf67d0005/