AT&T has confirmed a significant data breach affecting millions of its customers, with the compromised dataset found on the dark web. This dataset includes sensitive information such as social security numbers and private passcodes. The breach impacts approximately 7.6 million current account holders and 65.4 million past account holders, with a total of 73,481,539 records leaked. AT&T has begun notifying U.S. state authorities and regulators, with around 51,226,382 individuals, including current and former customers, being alerted according to a disclosure with Maine. The company has also faced dozens of class-action lawsuits following the breach.