AT&T announced Saturday that it is investigating a two-week-old data breach that published millions of customers' data on the dark web, a portion of the internet that can only be accessed using special software.
AT&T's preliminary review found that the leaked data was from approximately 2019 or earlier and includes personal information such as names, home addresses, phone numbers, dates of birth and Social Security numbers.
The data set does not contain personal financial information or call history.
In February, AT&T customers experienced an hours-long cellular outage, which the company clarified resulted from a system issue, not a cyberattack.
The company's CEO, John Stankey, later apologized for that incident and provided customer credits to those impacted.
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