The Custom Base Terms WordPress plugin before 1.0.3 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/8e1d65c3-14e4-482f-ae9e-323e847a8613