I would say since we're talking about security (which is a complex and huge field of IT) you may need to visit a variety of sources to find information unless it's something specific your looking for. I don't think there is one single source that will contain it all. Here are a few sites that I have bookmarked relating to security information/news.

Note: I'm just posting the website, you may have to browse to get to the specific news and information areas your looking for, these may not contain specific news feeds that your looking for.

http://.searchsecurity.techtarget.com -General portal filled with lots of security news/info/etc
http://www.microsoft.com/technet/Security/default.mspx -Microsoft Related Security Bulletins/Info
www.hackinthebox.org -hacker news, exploits/etc
www.networksecuritytech.com -security forums/info/etc

There is gobs of stuff out there, check the hacker related sites, the ones that cater to uncovering exploits and notifying the right people (white hats) as opposed to those that just want to break stuff. I learn a lot from them. Hope this helps.