Confluence sends previews of private information in trackbacks to other sites

see CSP-57183

We (IPS) run JIRA and Confluence locally to manage our tasks/doc. Sometimes we reference client's JIRA tickets in our confluence documentation. Totally separate domains, servers, users, etc. I happen to be looking at a JIRA instance for the Jet Propulsion Laboratory and noticed an External Reference to our Confluence. It even showed a preview of the text from our Confluence page, a totally private page! How do we prevent JIRA instances that are not even associated with us from show text previews of our Confluence doc simply because their ticket was referenced in our Confluence Doc??!!

The amount of information in trackbacks should be reduced or an option provided to disable trackbacks for private information.