This could allow a malicious actor to remotely execute malicious code on your site.
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 1.1 or later to resolve the vulnerability.
This software was last updated over a year ago and will likely not receive further updates or fixes. Note that deactivating the software does not remove the security threat unless mitigation rule by Patchstack is deployed.