This could allow a malicious actor to craft malicious formulas to then exploit vulnerabilities in the spreadsheet software or to execute commands to gain access to the victim';s PC.

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

Update to version 1.9.218 or later to remove the vulnerability. Patchstack users can turn on auto-update for vulnerable plugins only.