Today we’re releasing Kibana version 4.6.1, which includes a fix for a regression that we introduced in last week’s release, and Reporting version 2.4.1, which includes a high severity security fix.
In particular if you're using the Reporting plugin, we encourage you to upgrade immediately.
The regression that was fixed in Kibana core is probably worthy of an upgrade for everyone else as well.
Check out the blog post for more details: https://www.elastic.co/blog/kibana-4-6-1