We have recently released both Chef Server 12.4.0 and 12.4.1.
Chef Server 12.4.0 includes numerous Ruby on Rails CVE fixes that were announced last week and some new features. For a full description see our blog post: https://www.chef.io/blog/2016/01/28/chef-server-12-4-0-release-announcement-includes-security-updates/.
Chef Server 12.4.1 is a patch to fix a bug in Chef Server 12.4.0 that would prevent upgrades from Chef Server 11. See the full blog post here: https://www.chef.io/blog/2016/02/04/chef-server-12-4-1-release/
Thanks for using Chef!
- David McCown
Chef Software Engineer