CVE-2017-1000504
A race condition during Jenkins 2.94 and earlier; 2.89.1 and earlier startup could result in the wrong order of execution of commands during initialization. There is a very short window of time after startup during which Jenkins may no longer show the 'Please wait while Jenkins is getting ready to work' message but Cross-Site Request Forgery (CSRF) protection may not yet be effective.
Versions it affects
Software versions checked with the free lookup that CVE-2017-1000504 applies to, and the release that fixes it where the sources name one.
Is this running somewhere in your estate?
The Vulnerability Reporter inventories every machine and tells you when an advisory like this one applies to you.