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. External References: https://nvd.nist.gov/vuln/detail/CVE-2017-1000504 https://jenkins.io/security/advisory/2017-12-14/