BreachCensus

AT&T

United States of America

AT&T is an organisation in Wisconsin. It appears on the California Attorney General breach-notification register, the Delaware Attorney General data security breach database and the Wisconsin DATCP data breach list with 4 confirmed incidents; the most recent notice was filed on April 25, 2024.

Data as of October 17, 2026.

Sources

Confirmed incident

US-DE

Disclosed
April 25, 2024

Timeline

  1. April 25, 2024
    Reported to regulator Regulator

    DE AG breach notification: 50,469 Delaware residents affected

    source
  2. April 25, 2024
    Reported to regulator Regulator

    DE AG breach notification: 50,469 Delaware residents affected

    source
  3. April 25, 2024
    Reported to regulator Regulator

    DE AG breach notification: 50,469 Delaware residents affected

    source
  4. September 28, 2026
    Press coverage Press

    press report (press_reported): Ex-US soldier gets 70 months for role in AT&T, Snowflake data thefts

    source

Litigation

  • Possible litigation — multiple candidate dockets found, not yet resolved to a single case.

Notices on file

What a Delaware notice means

Governed by 6 Del. C. §12B-102. Notice to the Attorney General is required when a breach affects more than 500 Delaware residents.

Note: the count is Delaware residents only, not a total.

Delaware breach-notification register ↗

Confirmed incident

US-WI

Disclosed
March 30, 2024

Timeline

  1. March 30, 2024
    Reported to regulator Regulator

    WI AG breach notification: an unknown number of Wisconsin residents affected

    source

Litigation

  • Possible litigation — multiple candidate dockets found, not yet resolved to a single case.
What a Wisconsin notice means

Governed by Wis. Stat. §134.98. No state agency must be notified. Affected individuals must be told within 45 days, and the national credit bureaus too when 1,000 or more people are notified; DATCP lists breaches reported to it or found to affect Wisconsin consumers.

Note: the count is Wisconsin residents only when published, not a total; many notices do not include one.

Wisconsin breach-notification register ↗

Confirmed incident

US-CA

Disclosed
April 23, 2015

Timeline

  1. April 23, 2015
    Reported to regulator Regulator

    CA AG breach notification: an unknown number of California residents affected

    source
What a California notice means

Governed by Cal. Civ. Code §1798.82. A copy of the notification must be sent to the Attorney General when a single breach requires notifying more than 500 California residents.

Note: no affected-count is published on this register.

California breach-notification register ↗

Confirmed incident

US-WI

Occurred
April 21, 2014
Disclosed
June 13, 2014

Timeline

  1. June 13, 2014
    Reported to regulator Regulator

    WI AG breach notification: an unknown number of Wisconsin residents affected

    source

Related

Disclosed around the same time