No patched version is available. No way to contact the vendor. Reported to the WordPress plugins review team in 2023, Apr 17.
thiennv discovered and reported this Cross Site Scripting (XSS) vulnerability in WordPress Custom Post Type Generator 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 not been known to be fixed yet.