The plugin does not sanitize 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).
Go to Meow Apps ยป AI Engine ยป Chatbot tab ยป Visual Settings and put the following payload in the "Start Sentence" or "Compliance Text": <img src=x onerror=alert(/XSS/)>.