Millions of AT&T customers have been affected by a significant data breach, with their information surfacing on the dark web.

The personal data of approximately 73 million current or past AT&T customers has been exposed online, comprising details like addresses, social security numbers, and passwords, according to the US telecommunications company. The leaked information was discovered on the dark web. While AT&T stated that there was no evidence indicating data theft, it has initiated an investigation with cybersecurity experts. As a precautionary measure, the company has reset customers’ passwords and advised them to monitor their account activities and credit reports closely. The leaked data, which pertains to approximately 7.6 million current customers and 65.4 million former account holders, is believed to be from 2019 or earlier. While full names, email addresses, and dates of birth were compromised, AT&T assured that financial data was not part of the leak. The telecom giant noted uncertainty regarding the source of the data, whether originating from its own systems or a third-party supplier. With its wireless 5G network serving around 290 million individuals nationwide, AT&T is a leading provider of mobile and internet services in the United States.