The company’s marketing vendor suffered a security failure in January
and exposed CPNI data that included first names, wireless account
numbers, wireless phone numbers, and email addresses.

By Apurva Venkat

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.

https://www.csoonline.com/article/3690609/att-informs-9m-customers-about-data-breach.html

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