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.
AT&T’s marketing vendor suffered a security failure in January. Exposed CPNI data of AT&T customers included first names, wireless account numbers, wireless phone numbers, and email addresses.
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