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Re:Anatomy of an Attack: How I Hacked StackOverflow (2012) by esnard on Monday July 27, 2015 @05:22AM (#9954182)
They actually have a wall of fame: http://stackexchange.com/about/security
Re:Anatomy of an Attack: How I Hacked StackOverflow (2012) by LunaSea on Monday July 27, 2015 @07:13AM (#9954476)
It's not accurate though. I found a vulnerability on StackExchange too and am not listed although it was fixed.

Also I'm pretty sure that I've read much more StackExchange vulnerabilities as there are listed here.