This can be used to exploit logic in websites, cause a denial of service, or execute arbitrary code. A malicious actor could potentially execute commands to gain access to the admin panel.
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 0.9.75 or later to remove the vulnerability. Patchstack users can turn on auto-update for vulnerable plugins only.