Att Cpni Breach 2025. While call content and social security numbers were. The stolen information can easily provide cybercriminals, spies, and stalkers a logbook of the communications and activities of at&t customers over several months,.
Nearly eight million customers and 65.4 million former account holders were affected by the data breach, the company said. At&t said the breach exposed customer proprietary network information (cpni) such as the number of lines or subscribed.