According to Cloudbees, the jquery plugin is using an insecure version of Jquery. See https://docs.cloudbees.com/docs/cloudbees-ci-kb/latest/client-and-managed-masters/ci-2-277-1-2-jquery-3-5-x-upgrade for details.

This plugin should be updated to utilize a secure version of jQuery and to remove the use of the jquery jenkins plugin so that it can be removed from Jenkins installations.