HackingFinancial ServicesTechnologyFinanceStolen CredentialsSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedPIIIdentity (basic)LowContained

TransUnion

bd_217b0e65bf1e4897 · schema v1 · pii pii-v1

Severity

Low

Discovered

—

Filed

Aug 27, 2025

To disclose

—

Affected

Not disclosed

Linked

15 records

Confidence

68%

Full breach record for TransUnion →11 incidents on file

TransUnion LLC reported a cybersecurity incident involving unauthorized access to a third-party application used for U.S. consumer support operations. The breach exposed limited personal information (PII) but explicitly excluded credit reports or core credit data. TransUnion engaged Cyberscout for investigation and remediation, offering 24 months of complimentary credit monitoring and fraud assistance to affected individuals. The incident was reported to the California Office of the Attorney General under SB 24 on July 28, 2025.

J jump to incidentP pin to compareR raw source

Incident timeline

Jul 28, 2025

Begins

Aug 27, 2025

Filed

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

Maine State AGbd_9d7ad1a3ef9bd9ae2025-08-27Verified by operator
Vermont State AGbd_82d4818cdee39c862025-09-01 · +5dVerified by operator
Oregon State AGbd_5b59f10c6f6c553f2025-09-02 · +6dVerified
Iowa State AGbd_fd85f6604075cd912025-09-02 · +6dVerified by operator

Show 6 more filings ↓up to 12d gap

Montana State AGbd_9bac2141a674997f2025-09-03 · +7dVerified by operator
New Hampshire State AGbd_331561e568edbb3f2025-09-04 · +8dVerified by operator
Texas State AGbd_83b605646965217d2025-09-04 · +8dVerified by operator
South Carolina State AGbd_d7d141dc595dd1b02025-09-04 · +8dVerified by operator
Massachusetts State AGbd_d87eb450bda408862025-09-04 · +8dVerified by operator
Nebraska State AGbd_aaa181287c2471442025-09-08 · +12dVerified 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: —
Breach occurred: Jul 28, 2025
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain Compromise
Threat actor: External
Regulator citations: Submitted Breach Notification to California Office of the Attorney General (SB 24)
Third party: via Cyberscout
Initial access: supply_chain

During the incident: Engaged Cyberscout to assist with the investigation
Providing access to credit monitoring services (myTrueIdentity Online) for 24 months
Providing proactive fraud assistance through Cyberscout
Changes made: Enhancing security controls 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 ↗

Maine State AGAug 27 · first

California State AGAug 27 · first · 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 (ME), 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://oag.ca.gov/ecrime/databreach/reports/sb24-607772
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 27, 2025
Raw hash: d3e5c41c3a516d7f45380e72971b6a3a19fc8fb560777f6298a183c807608eb8

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityTransUnion

Victim entityTransUnion

IncidentThird-Party / Supply Chain

Stated responseEngaged Cyberscout to assist with the investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov