AT&T has confirmed that some nine million customer accounts have been exposed after a third-party marketing vendor has been hacked.
Customer information such as first names, account numbers, phone numbers, and email addresses were compromised as a result of the data breach.
AT&T’s own systems were not affected by the breach, nonetheless.
While the data breach notification does not share the number of impacted customers, AT&T told BleepingComputer that “approximately 9 million wireless accounts had their Customer Proprietary Network Information accessed.”
Exposed CPNI data includes customer first names, wireless account numbers, wireless phone numbers, and email addresses.
“A small percentage of impacted customers also had exposure of rate plan name, past due amount, monthly payment amount, various monthly charges and/or minutes used. The information was several years old,” AT&T said.
The company added that its systems were not compromised in the vendor security incident and that the exposed data is mostly associated with device upgrade eligibility.
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