US mobile phone operator AT&T is notifying millions of wireless customers that its customer network information (CPNI) was compromised in a data breach at a third-party vendor.
One of the largest carriers in the US, AT&T, has roughly 200 million wireless customers, but only a small percentage of the total was affected by the incident. “Approximately 9 million wireless accounts had access to customer proprietary network information,” AT&T said in an emailed statement.
The vendor in question, AT&T, told SecurityWeek, it provides marketing services. The data breach did not affect any personal or financial data.
Read more: Millions of AT&T Customers Notified of Data Breach at Third-Party Vendor
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