The CB (legacy) WordPress plugin through 0.9.4.18 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/9b3cda9a-17a7-4173-93a2-d552a874fae9/