You can try to run
# plesk repair db -y
to make sure that no database inconsistencies cause this.
If that does not help, for "cvssScore" we don't yet have any specific knowledge on file. I think it is probably caused by a theme or plugin that is not following Wordpress standards. Please open a ticket with Plesk support staff in that case so that the issue can be checked and fixed on your server.
In that case it is probably an incompatible theme or plugin that is causing the error. You can easily test this: Simply install another, empty Wordpress instance through Plesk in a fresh subdomain, then check the vulnerabilities there.
In that case it is probably an incompatible theme or plugin that is causing the error. You can easily test this: Simply install another, empty Wordpress instance through Plesk in a fresh subdomain, then check the vulnerabilities there.