iTunes Connect bug logs developers in to other developers’ accounts at random | Ars Technica:

This morning, a number of developers signed in to Apple's iTunes Connect service only to be greeted by a list of apps that didn't belong to them. TechCrunch has a good roundup of tweets from affected developers—it seems that whenever developers signed in with their credentials, they were being granted access to other developers' accounts at random.

This is perhaps the most serious Apple Fail I've seen to date. Not only could you see other developers' info, I assume you could also edit it. That's a serious financial and fairly proprietary business info breach.