The Bubble Menu WordPress plugin before 3.0.5 does not sanitize 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/0a0ecdff-c961-4947-bf7e-bd2392501e33