HackingTelecom & MediaInformationStolen CredentialsData ExfiltratedCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDFinancial accountAuthenticationMediumContained

AT&T INC.

bd_5109fdbae81c1550 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 26, 2024

Filed

Apr 25, 2024

To disclose

4 weeks

Affected

Not disclosed

Linked

12 filings

Confidence

64%

Full breach record for AT&T INC. →23 incidents on file

AT&T notified customers that their personal information (names, SSNs, DOBs, account numbers, passcodes) was found in a dataset released on the dark web on March 17, 2024. The data originated from June 2019. AT&T reset affected passcodes and offered one year of credit monitoring via Experian. The incident status is contained.

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Incident timeline

undetected · 1760 days

discovery → filing · 4 weeks / 30 days

Jun 1, 2019

Begins

Mar 26, 2024

Discovered

Apr 25, 2024

Filed

This filing is one of 12 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

New Hampshire State AGbd_79d7d9a7036db0e92024-04-15 · +10dVerified
Washington State AGbd_2c04c4a158e44fd22024-04-10 · +15dVerified
Massachusetts State AGbd_36f4d420cf6fa07e2024-04-10 · +15dVerified
Oregon State AGbd_7534be63ba9185ec2024-04-10 · +15dVerified

Show 6 more filings ↓up to 24d gap

South Carolina State AGbd_54dc2a4241a0af372024-04-09 · +16dCandidate
California State AGbd_962bc7783c26b3452024-04-09 · +16dVerified
Montana State AGbd_9c10bf1a6486d8102024-04-09 · +16dVerified
Vermont State AGbd_ae9a0cefc958af772024-04-09 · +16dVerified
Indiana State AGbd_ff7d944ebd2888c92024-04-09 · +16dVerified
Illinois State AGbd_cf6680ffde30d0f82024-04-01 · +24dVerified

Showing first 10 of 11 linked disclosures.

Name: AT&T INC.
norm: at t
Domain: att.com

Name: AT&T INC.
norm: at t
Domain: att.com
Industry: Telecom & Mediallm

Discovered: Mar 26, 2024
Breach occurred: Jun 1, 2019 – Jun 30, 2019
Undetected for: 1,760 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDCredentials
Data elements: Social Security numberDate of birth
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1566.002 Spearphishing Link
Threat actor: ExternalFinancial
Initial access: valid_credentials

During the incident: Offered one year of complimentary credit monitoring, identity theft detection and resolution services provided by Experian’s® IdentityWorksSM
Reset your passcode
Changes made: Launched a robust investigation supported by internal and external cybersecurity experts
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 4 weeks(30 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 11 states

View merged incident ↗

Illinois State AGApr 1 · first

South Carolina State AG+8d

California State AG+8d

Montana State AG+8d

Vermont State AG+8d

Indiana State AG+8d

Washington State AG+9d

Massachusetts State AG+9d

Oregon State AG+9d

New Hampshire State AG+14d

Delaware State AG+24d · this page

Pattern: first filing Apr 1 (IL), last Apr 25 (DE) — a 24-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 11 — the full spread may be wider.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://attorneygeneral.delaware.gov/wp-content/uploads/sites/50/2024/04/ATT-Customer-Notification-Letter-Template.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 25, 2024
Raw hash: 196b2b2a8ea4441224fd09b7bb7233681f7920c0aadde0b2516d463ee77f3eeb

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityAT&T INC.

Victim entityAT&T INC.

Incidentdiscovered Mar 26, 2024

Stated responseOffered one year of complimentary credit monitoring, identity theft detection and resolution services provided by Experian’s® IdentityWorksSM

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceattorneygeneral.delaware.gov