Social EngineeringFinancial ServicesTechnologyFinancePhishingData ExfiltratedCustomer Data InvolvedTargetedGovernment IDIdentity (basic)HighContained

TransUnion

bd_331561e568edbb3f · schema v1 · pii pii-v1

Severity

High

Discovered

Jul 30, 2025

Filed

Sep 4, 2025

To disclose

5 weeks

Affected

16,508state residents only

Linked

15 records

Confidence

66%

Full breach record for TransUnion →11 incidents on file

TransUnion LLC notified the New Hampshire Attorney General of a cybersecurity incident involving unauthorized access to its Salesforce application. A threat actor used social engineering (posing as a help desk technician) to trick call center agents into downloading a malicious application, gaining limited access on July 28-29, 2025. Consumer Social Security Numbers were exfiltrated. Approximately 16,508 New Hampshire residents were affected. TransUnion contained the breach, notified the FBI, and is offering 24 months of complimentary credit monitoring to affected individuals.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 2 days

discovery → filing · 5 weeks / 36 days

Jul 28, 2025

Begins

Jul 30, 2025

Discovered

Sep 4, 2025

Filed

vs. sector median

3 wks faster

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

Texas State AGbd_83b605646965217d2025-09-04Verified by operator
South Carolina State AGbd_d7d141dc595dd1b02025-09-04Verified by operator
Massachusetts State AGbd_d87eb450bda408862025-09-04Verified by operator
Montana State AGbd_9bac2141a674997f2025-09-03 · +1dVerified by operator

Show 6 more filings ↓up to 8d gap

Oregon State AGbd_5b59f10c6f6c553f2025-09-02 · +2dVerified
Iowa State AGbd_fd85f6604075cd912025-09-02 · +2dVerified by operator
Vermont State AGbd_82d4818cdee39c862025-09-01 · +3dVerified by operator
Nebraska State AGbd_aaa181287c2471442025-09-08 · +4dVerified by operator
California State AGbd_217b0e65bf1e48972025-08-27 · +8dVerified by operator
Maine State AGbd_9d7ad1a3ef9bd9ae2025-08-27 · +8dVerified 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: Jul 30, 2025
Breach occurred: Jul 28, 2025 – Jul 29, 2025
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 8, 2025
Affected individuals: 16,508state-resident count only
Data types: Government IDIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1566 Phishing
Threat actor: ExternalFinancial
Regulator citations: Notified New Hampshire Attorney General
Initial access: phishing_link

During the incident: Shut down the two call center agents’ system access
Blocked all known URLs for the malicious connected application
Informed the FBI
Changes made: Offering complimentary credit monitoring services for 24 months
Providing proactive fraud assistance
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(36 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 ↗

California State AGAug 27 · first

Maine State AGAug 27 · first

South Carolina State AG+8d

Massachusetts State AG+8d

New Hampshire State AG+8d · this page

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://mm.nh.gov/files/uploads/doj/remote-docs/transunion-20250904.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 4, 2025
Raw hash: 9d54a8a25b27222296c34a11b8cd34c2cbaa89ddc4c48c4f4c0e55d328cce1fa

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityTransUnion

Victim entityTransUnion

Incidentdiscovered Jul 30, 2025

Stated responseShut down the two call center agents’ system access

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov