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/ae9bc19d-1634-4501-a258-8c56b2afee88/