UnknownGovernment IDCritical

TransUnion

bd_b187955d41edb132 · schema v1 · pii pii-v1

Severity

Critical

Discovered

—

Filed

Aug 26, 2025

To disclose

—

Affected

4,461,511scope not determined

Linked

9 filings

Confidence

95%

Full breach record for TransUnion →13 incidents on file

TransUnion LLC reported a data breach to the Wisconsin DATCP. The public was notified on 2025-08-26. The incident occurred on July 28, 2025. Data accessed: Social Security numbers and dates of birth. 4,461,511 individuals were affected. 69,256 Wisconsin residents were affected.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >30d

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

Incident timeline

Jul 28, 2025

Begins

Aug 26, 2025

Filed

This filing is one of 9 about the same incident.View merged incident

A leak claim by shinyhunters about this victim predates this filing by 59 days.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (8) · sorted by filing gap

Indiana State AGbd_085cfd43425228862025-08-26Verified
Delaware State AGbd_b4d8a6f47a0b6abc2025-08-26Verified by operator
California State AGbd_217b0e65bf1e48972025-08-27 · +1dVerified
Maine State AGbd_9d7ad1a3ef9bd9ae2025-08-27 · +1dVerified

Show 4 more filings ↓up to 13d gap

Vermont State AGbd_82d4818cdee39c862025-09-01 · +6dVerified by operator
Iowa State AGbd_fd85f6604075cd912025-09-02 · +7dVerified by operator
Montana State AGbd_9bac2141a674997f2025-09-03 · +8dVerified by operator
Nebraska State AGbd_aaa181287c2471442025-09-08 · +13dVerified by operator

Name: TransUnion
norm: transunion
Domain: transunion.com

Name: TransUnion
norm: transunion
Domain: transunion.com

Discovered: —
Breach occurred: Jul 28, 2025
Materiality determined: —
Notification sent: —
Affected individuals: 4,461,511scope not determined
Data types: Government ID
Data elements: Social Security number
Attack vector: Unknown
Threat actor: External

Compliance flags: Leak >30d
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 9 filings · 9 states

View merged incident ↗

Indiana State AGAug 26 · first

Delaware State AGAug 26 · first

Wisconsin State AGAug 26 · first · this page

California State AG+1d

Nebraska State AG+13d

Pattern: first filing Aug 26 (IN), last Sep 8 (NE) — a 13-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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://datcp.wi.gov/Pages/Programs_Services/DataBreaches.aspx
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 26, 2025
Raw hash: acd4d07f75fb1c2f1043dae4ce852cc3c92a85f0939ee7571979d02f8a69d6ca

Linked disclosures

Regulatory filings (8) · sorted by filing gap

Reporting entityTransUnion

Victim entityTransUnion

IncidentUnknown

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenancedatcp.wi.gov