UPDATE: Aug. 20–Apple has updated its Apple Web Server notifications page to officially credit Turkish security researcher Ibrahim Balic for demonstrating security flaws in Apple’s Development Center.
The following listing acknowledges Balic’s contribution, though it doesn’t confirm his claims of sole responsibility:

2013-07-22 iadworkbench.apple.com

An information disclosure issue was addressed. We would like to acknowledge Ibrahim BALIC (Balich IT – www.balicbilisim.com) for reporting this issue.

UPDATE: After more than a week of downtime, Apple’s iOS, Mac and Safari