Update the WordPress Absolutely Glamorous Custom Admin plugin to the latest available version (at least 6.9, additional hardening introduced in version 6.9.2).
Jörgson discovered and reported this Cross Site Scripting (XSS) vulnerability in WordPress Absolutely Glamorous Custom Admin Plugin. This could allow a malicious actor to inject malicious scripts, such as redirects, advertisements, and other HTML payloads into your website which will be executed when guests visit your site. This vulnerability has been fixed in version 6.9.