No patched version is provided by the vendor.
Dave Jong (Patchstack) discovered and reported this Open Redirection vulnerability in WordPress Ninja Popups Plugin. This could allow a malicious actor to redirect users from one site to the other due to the redirect URL not being validated. Users could be tricked to visiting a legitimate site to then be redirected to a malicious site and cause a phishing incident. This vulnerability has not been known to be fixed yet.