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.
CVSS score is a way to evaluate and rank reported vulnerabilities in a standardized and repeatable way but which is not ideal for WordPress.
This security issue has a low severity impact and is unlikely to be exploited.
Update to version 4.1.3 or later to remove the vulnerability. Patchstack users can turn on auto-update for vulnerable plugins only.