Today's update is about checking for the security issue mitigations detailed below
Two errors are possible:
unRaid version 6.7.0 to 6.7.2 - Install the plugin via the apps tab as detailed in the above link. (You would have also received a separate warning that your OS version is out of date - Ideally, unless there is a compelling reason for you to remain on the unRaid version you are using, it is highly recommended to upgrade to 6.8.2+)
unRaid version greater than 6.7.2 and less than 6.8.1, the advice is to upgrade your OS to 6.8.2+ Again, you would have also received a separate warning advising to upgrade your OS
NOTE: the mitigation plugin will ALSO help secure your server if you are running any unRaid version of 6.6.x Unfortunately, Fix Common Problems requires unRaid 6.7.0 to operate, so no warning / error will be sent if you are still on those older versions of unRaid.
I always advise users to keep their OS and plugin versions up to date with the latest stable version.