No patched version is available. No reply from the vendor.
Hoang Van Hiep - sk4rl1ghT discovered and reported this Cross Site Scripting (XSS) vulnerability in WordPress 1app Business Forms 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.