The Simple Table Manager WordPress plugin through 1.5.6 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/ef8029e0-9282-401a-a77d-10b6656adaa6
https://github.com/nightcloudos/bug_report/blob/main/vendors/poc2.md