This vulnerability is highly dangerous and expected to become exploited.
Note that this vulnerability affects the PRO version of the plugin. As the free and PRO version used the same slug, there is no way to differentiate between the two.
A broken access control issue refers to a missing authorization, authentication or nonce token check in a function that could lead to an unprivileged user to executing a certain higher privileged action.
CVSS score is a way to evaluate and rank reported vulnerabilities in a standardized and repeatable way but which is not ideal for WordPress.
We advise to mitigate or resolve the vulnerability immediately.
Patchstack has issued a mitigation rule to block any attacks until you have updated to a fixed version.
Update to version 2.23.3 or later to resolve the vulnerability. Patchstack users can turn on auto-update for vulnerable plugins only.