There are number of people posting comments about how this isn't an issue since Apache's code is open. Let me outline a few possible issues even with the code being
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1. If Apache keeps non-released security information in their bug tracker it could end up being disclosed. Great if you want to get your hands on security issues before patches are released.
2. Private comments can be leaked out which are probably not meant for general consumption. Probably not a huge issue, but it depends on the content.
3. Many people use the same passwords everywhere -- and the same usernames. Any cracked accounts could prove quite useful.
On the flip side it goes to show that XSS and CSRF are, as many security (open and closed) groups note, are a major problem -- and are pretty easy to exploit. While it is not fun to have this occur it may wake up some engineers into seeing that 'if it can happen to Apache maybe we should take it seriously'.
Then there is the whole thing of Apache using Jira instead of something Open
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http://blogs.atlassian.com/news/2010/04/oh_man_what_a_day_an_update_on_our_security_breach.html ...
:-)