As immediate action, update the affected plugin. If you're unable to do so, ask your hosting provider or web developer for help.
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.
This security issue has a low severity impact and is unlikely to be exploited.
Patchstack has issued a mitigation rule to block any attacks until an official patch becomes available, can be tested and be safely applied.
19 Jan, 2024