The Steveas WP Live Chat Shoutbox WordPress plugin through 1.4.2 does not sanitise and escape a parameter before using it in a SQL statement via an AJAX action available to unauthenticated users, leading to a SQL injection.
View the template here CVE-2023-1020.yaml
References:
https://wpscan.com/vulnerability/4e5aa9a3-65a0-47d6-bc26-a2fb6cb073ff