AT&T data breach

What happened

In March 2024, tens of millions of records allegedly breached from AT&T were posted to a popular hacking forum. Dating back to August 2021, the data was originally posted for sale before later being freely released. At the time, AT&T maintained that there had not been a breach of their systems and that the data originated from elsewhere. 12 days later, AT&T acknowledged that data fields specific to them were in the breach and that it was not yet known whether the breach occurred at their end or that of a vendor. AT&T also proceeded to reset customer account passcodes, an indicator that there was sufficient belief passcodes had been compromised. The incident exposed names, email and physical addresses, dates of birth, phone numbers and US social security numbers.

What data leaked

• Dates of birth
• Email addresses
• Government issued IDs
• Names
• Phone numbers
• Physical addresses

What to do if you had an account

1. Turn on two-step sign-in. Enable two-factor authentication where the service offers it, preferably with an authenticator app or a passkey. A leaked password alone is then not enough to get in.
2. Expect targeted phishing. Leaked contact details are used to write convincing fake messages that mention the breached company or your real name. Do not click links in unexpected emails or texts about this account; go to the site by typing its address.
3. Watch for scam calls and SIM swaps. Be suspicious of calls and texts that claim to be from your bank or a courier. Ask your mobile operator for a port-out or SIM-change PIN if it offers one.
4. Guard against identity fraud. Identity documents and dates of birth cannot be changed like a password. Consider a credit freeze or fraud alert where your country offers one, and be wary of anyone who 'verifies' you using those details.

Check your email at haveibeenpwned.com

We do not run email lookups ourselves. The search is done on haveibeenpwned.com, the service this list comes from.