AT&T
MEDIUM RISKData breach — August 2021
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.
search Check if you were affected — freeData exposed in this breach
What happened in the AT&T data breach?
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.
The exposed data included 6 types of personal information. Learn more about what a data breach means for you.
Quick answer — was AT&T hacked?
Yes. AT&T was breached in August 2021. The breach exposed 49,102,176 records including dates of birth, email addresses, government issued ids. This breach has been independently verified. If your email was involved, your data may still be at risk today. Check if you were affected.
Why was the AT&T breach so dangerous?
The AT&T breach exposed 49,102,176 records — that is 49.1M people whose personal data is now circulating on the dark web. The combination of dates of birth, email addresses, government issued ids makes this a medium-risk breach that should be addressed promptly.
Don't wait to find out — check if your email was exposed in this breach now.
What data was stolen in the AT&T breach?
Dates of birth — used to verify identity for account takeover and fraud
Email addresses — used for phishing attacks and credential stuffing against your other accounts
Government issued IDs — enables full identity theft including fraudulent credit applications
Names — used to build profiles and target you with personalised scams
Phone numbers — enables SIM swapping attacks and targeted SMS phishing scams
Physical addresses — combined with other data, used for identity theft and physical fraud
Is the AT&T breach still dangerous in 2026?
Yes. Stolen data from the AT&T breach remains dangerous years after the incident. Research shows that over 65% of stolen credentials from older breaches have never been changed by the account holders. Attackers routinely compile data from multiple breaches to build complete profiles, and credentials from 2021 are still actively used in credential stuffing attacks today.
Personal information like email addresses, phone numbers, and dates of birth never expire. Even if you changed your AT&T password, the other exposed data can be combined with information from other breaches to target you. Learn more about how long stolen data stays dangerous.
Frequently asked about the AT&T breach
Approximately 49,102,176 user records were exposed in the AT&T breach in August 2021.
Yes. Leaked credentials are actively used in credential stuffing attacks years after a breach. If you reused your AT&T password elsewhere and haven't changed it, those accounts remain at risk today.
Enter your email in the free checker on EmailLeaked. We scan 12 billion+ breach records including the full AT&T dataset and tell you instantly whether your email was exposed and what data was taken.
Change your AT&T password immediately, change any other account where you used the same password, enable two-factor authentication on all important accounts, and monitor for phishing emails over the next 90 days.
Who was affected by the AT&T breach?
The AT&T data breach affected approximately 49,102,176 users who had accounts with the service. With 49.1M records exposed, this is one of the larger breaches tracked in our database of 970+ known breaches.
If you ever created an account with AT&T or used their services, your data may have been included in this breach. Check your email now to find out. You can also read our guide on what to do immediately after a data breach.
If your email was in the AT&T breach
Change your AT&T password immediately
Go to AT&T and change your password right now. Use a strong, unique password that you have never used anywhere else.
Change any account sharing that password
If you used the same password on other sites, change it on every one of them. Attackers test stolen credentials on hundreds of popular sites within hours.
Enable two-factor authentication
Turn on 2FA on AT&T and every important account. Even if your password is known, attackers cannot get in without the second factor.
Check your other accounts for this breach
Run a full email check to see every breach your email appears in — not just this one.
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