AT&T Data Breach History

This page tracks the AT&T data breach history and cybersecurity incidents affecting AT&T (United States). BreachHistory currently indexes 15 publicly disclosed or catalogued incidents spanning 2007 through 2026, with approximately 359.4 million records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.

The AT&T breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.

Largest AT&T Data Breaches

The largest indexed incidents include the 2026 AT&T — 176M records resurfaced with decrypted SSNs, the 2024 Snowflake call records breach — 110M, and the 2024 Historical dataset dark web leak — 73M, along with additional historical incidents involving exposed passwords, public databases, and large-scale data scraping. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by AT&T or a regulator. Below is the list of large data breaches:

• 2026 2026 AT&T — 176M records resurfaced with decrypted SSNs — about 176.0M records exposed · Catalogued incident
• 2024 2024 Snowflake call records breach — 110M — about 110.0M records exposed · Catalogued incident
• 2024 2024 Historical dataset dark web leak — 73M — about 73.0M records exposed · Catalogued incident
• 2010 2010 — AT&T: Details of iPad 3G users hacked from AT&T website,… — about 114.0K records exposed · Catalogued incident
• 2008 2008 — AT&T: A laptop was stolen from a car containing… — about 113.0K records exposed · Catalogued incident
• 2010 2010 — AT&T: Data breach reported, 100K records — about 100.0K records exposed · Catalogued incident
• 2008 2008 — AT&T: Data breach reported, 100K records — about 100.0K records exposed · Catalogued incident
• 2009 2009 — AT&T: A temporary employee for AT&T was arrested today on… — about 2.1K records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include email addresses, Social Security numbers and national IDs, phone numbers, names, physical addresses, bank account details, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

AT&T Data Breach 2026

At the time of this update, BreachHistory catalogues 1 2026 incident related to AT&T. Most recent entry: 2026 AT&T — 176M records resurfaced with decrypted SSNs. New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.

What To Do If You Were Affected

If you believe your account may have been involved in a AT&T data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.

This AT&T breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.