AT&T informs 9M customers about data breach

AT&T is informing customers about a data breach at a vendor’s system that allowed threat actors to gain access to AT&T’s Customer Proprietary Network Information (CPNI).

The incident came to light after customers posted the email communication from AT&T on community forums to know if it was legitimate or email fraud.

“We recently determined that an unauthorized person breached a vendor’s system and gained access to your ‘Customer Proprietary Network Information’ (CPNI),” AT&T said in the email.

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