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AT&T says leaked data of 70 million people is not from its systems
(www.bleepingcomputer.com)
Information about data breaches, data leaks, ransomware attacks, and other related stories.
Well, you see, they sold that data to a third party, and the third party was hacked. Probably.
And that third party's name? ATT2LegallyDistinct LLC.
They don't even have to have sold any data at all. A ton of things handling CPNI that are operated by carriers are directly controlled by third party companies. Including purpose built systems used only by the carrier, but operated and maintained by a third party contract.