The Simple Ajax Chat WordPress plugin before 20240412 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/8514b8ce-ff23-4aba-b2f1-fd36beb7d2ff/