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 inject their own content into pages and posts of your website. This could also be abused to inject phishing pages into your 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.