The GDPR Cookie Compliance WordPress plugin before 4.15.7 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/7a903d61-2792-4fe0-a26b-f400f4a3124b/