The chartjs WordPress plugin through 2023.2 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/c3d43aac-66c8-4218-b3f0-5256f895eda3/