Jeff Thomas's answer is correct (a.k.a. "the bottom of every page"). If you have admin privileges on your Bitbucket Server instance you can also get detailed version information in the Administration area:
Click on "Administration" (top right corner, a little gear icon).
And then in the left menu, at the very bottom, under "Support", click on "Support Tools."
And then click on the "System Information" tab. You should see something like this:
Base URL: http://vm.bit-booster.com/Bitbucket Build Number: 4007001 Build Timestamp: Tue Jun 14 04:28:14 EDT 2016 Build Version: 4.7.1
Hello! My name is Mark Askew and I am a Premier Support Engineer for products Bitbucket Server/Data Center, Fisheye & Crucible. Today, I want to bring the discussion that Jennifer, Matt, and ...
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