At&T Security Breach 2025. Here’s how to submit a claim. At&t customers will be notified by the company if their data was compromised in the major security breach.

At&t customers will be notified by the company if their data was compromised in the major security breach. At&t says more than 7.6 million current customers and 65 million former customers were affected by a data leak exposing social security numbers, passcodes, and other information.