HackingFinancial ServicesTechnologyFinanceStolen CredentialsCapture Stored DataSupply Chain (3P Vendor)Customer Data InvolvedData ExfiltratedPIIIdentity (basic)MediumContained

TransUnion

bd_9bac2141a674997f · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Sep 3, 2025

To disclose

—

Affected

9,410state residents only

Linked

15 records

Confidence

67%

Full breach record for TransUnion →11 incidents on file

TransUnion LLC notified Montana and Rhode Island residents of a cyber incident involving unauthorized access to personal data stored on a third-party application used for U.S. consumer support operations. The incident involved limited personal information (PII) but explicitly excluded credit reports. Approximately 17,155 Rhode Island residents were identified as impacted. TransUnion is offering 24 months of complimentary credit monitoring and fraud assistance via Cyberscout.

J jump to incidentP pin to compareR raw source

Incident timeline — partial

? — ?

Breach window unknown

Sep 3, 2025

Filed

No interval is drawn: no breach start or discovery date is on record for this filing.

This filing is one of 15 records about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

New Hampshire State AGbd_331561e568edbb3f2025-09-04 · +1dVerified by operator
Texas State AGbd_83b605646965217d2025-09-04 · +1dVerified by operator
South Carolina State AGbd_d7d141dc595dd1b02025-09-04 · +1dVerified by operator
Massachusetts State AGbd_d87eb450bda408862025-09-04 · +1dVerified by operator

Show 6 more filings ↓up to 7d gap

Oregon State AGbd_5b59f10c6f6c553f2025-09-02 · +1dVerified
Iowa State AGbd_fd85f6604075cd912025-09-02 · +1dVerified by operator
Vermont State AGbd_82d4818cdee39c862025-09-01 · +2dVerified by operator
Nebraska State AGbd_aaa181287c2471442025-09-08 · +5dVerified by operator
California State AGbd_217b0e65bf1e48972025-08-27 · +7dVerified by operator
Maine State AGbd_9d7ad1a3ef9bd9ae2025-08-27 · +7dVerified by operator

Showing first 10 of 14 linked disclosures.

Name: TransUnion
norm: transunion
Domain: transunion.com

Name: TransUnion
norm: transunion
Domain: transunion.com
Industry: Financial ServicesllmTechnologyllm

Discovered: —
Materiality determined: —
Notification sent: Sep 1, 2025
Affected individuals: 9,410state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1119 Automated Collection
Threat actor: External
Initial access: supply_chain

During the incident: Providing access to credit monitoring services at no charge for 24 months
Providing proactive fraud assistance through Cyberscout
Enhancing security controls to minimize risk of similar incident
Changes made: Enhancing security controls as appropriate to minimize the risk of any similar incident in the future
Source: Quoted from the filing itself, not independently verified.

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 ↗

California State AGAug 27 · first

Maine State AGAug 27 · first

Vermont State AG+5d

Oregon State AG+6d

Iowa State AG+6d

Montana State AG+7d · this page

New Hampshire State AG+8d

Texas State AG+8d

South Carolina State AG+8d

Massachusetts State AG+8d

Nebraska State AG+12d

Pattern: first filing Aug 27 (CA), last Sep 8 (NE) — a 12-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 14 — 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://dojmt.gov/wp-content/uploads/2025/09/Consumer-notification-letter-23.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 3, 2025
Raw hash: d7896cbceacaf2d92869a85cf8dde43efb029f46e6c1be652d6e9726ad83b627

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityTransUnion

Victim entityTransUnion

IncidentThird-Party / Supply Chain

Stated responseProviding access to credit monitoring services at no charge for 24 months

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov