While this vulnerability can be initiated by the role shown in "Required Privilege", successful exploitation requires a privileged user to perform an action — such as clicking a malicious link, visiting a crafted page, or submitting a form.

This could allow a malicious actor to execute commands on the target website. This can be used to gain backdoor access to then take full control of the website.

CVSS score is a way to evaluate and rank reported vulnerabilities in a standardized and repeatable way but which is not ideal for WordPress.