Update the WordPress Redirection for Contact Form 7 plugin to the latest available version (at least 2.8.0).
Rafie Muhammad (Patchstack) discovered and reported this Privilege Escalation vulnerability in WordPress Redirection for Contact Form 7 Plugin. This could allow a malicious actor to escalate their low privileged account to something with higher privileges. After this they could take full control of the website if high privileges are gained. This vulnerability has been fixed in version 2.8.0.