Atlassian Stored Passwords in Cleartext?
blog.webnet-it.co.jp
blog.webnet-it.co.jp
They are doing the responsible thing by informing their users. It's posts with titles like this that prevent more companies from disclosing security breaches.
Their second response was far better, and addresses all of the concerns their first response generated.
Presumably if this was an unmaintained legacy system if you had changed your password since July 2008 your account would be safe. There is no mention of this though.
Looks like they were storing the passwords of older accounts in clear-text (see 'Lessons we've learned today').