AT&T says data from 73M accounts leaked to dark web

AT&T says it has determined that AT&T data-specific fields were contained in a data set released on the dark web approximately two weeks ago. While AT&T has made this determination, it is not yet known whether the data in those fields originated from AT&T or one of its vendors. With respect to the balance of the data set, which includes personal information such as social security numbers, the source of the data is still being assessed. AT&T has launched a robust investigation supported by internal and external cybersecurity experts. Based on our preliminary analysis, the data set appears to be from 2019 or earlier, impacting approximately 7.6 million current AT&T account holders and approximately 65.4 million former account holders. Currently, AT&T does not have evidence of unauthorized access to its systems resulting in exfiltration of the data set. As of today, this incident has not had a material impact on AT&T’s operations, the company says.