HackingFinancial ServicesTechnologyFinanceStolen CredentialsSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)PIIHighContained

TransUnion

bd_9d7ad1a3ef9bd9ae · schema v1 · pii pii-v1

Severity

High

Discovered

Jul 30, 2025

Filed

Aug 27, 2025

To disclose

28 days

Affected · nationwide

4,461,51116,828 in this filing

Linked

15 records

Confidence

65%

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 occurred on July 28, 2025, and was discovered on July 30, 2025. Approximately 4.46 million individuals were affected, including 16,828 Maine residents. The incident involved limited personal information (names, addresses, etc.) but explicitly excluded credit reports and core credit information. TransUnion provided 24 months of complimentary credit monitoring and fraud assistance.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Jul 30, 2025 → Filed with AG Aug 27, 202528d ✓ ME AG ≤30d28 days discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 2 days

discovery → filing · 28 days

Jul 28, 2025

Begins

Jul 30, 2025

Discovered

Aug 27, 2025

Filed

vs. sector median

4 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

California State AGbd_217b0e65bf1e48972025-08-27Verified 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: Jul 30, 2025
Breach occurred: Jul 28, 2025
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 26, 2025
Affected individuals: 4,461,511state + nationwide
Data types: Identity (basic)PII
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain Compromise
Threat actor: External
Regulator citations: Filed notification with Maine Attorney General
Third party: via Third-party application serving U.S. consumer support operations
Initial access: supply_chain

During the incident: Providing consumers with access to myTrueIdentity Online (TransUnion) Credit Monitoring services at no charge for two years from the date of enrollment
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.

Time to disclose: 28 days(28 days from discovery to filing)
Compliance flags: ME AG ≤30d · 28dME CRA notice due
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Jul 30, 2025
→ Filed with AG: Aug 27, 2025
28d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Jul 30, 2025 → Filed with AG: Aug 27, 2025	28d	30 days	ME AG ≤30d

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 · 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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/3dcd9b7c-bce3-4685-bffd-f728ce96e2fd.html
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: cf9f549b0dca132d96f672d979030bec3f39f6a09ba22ef8fe2fbf646d07d13f

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityTransUnion

Victim entityTransUnion

Incidentdiscovered Jul 30, 2025

Stated responseProviding consumers with access to myTrueIdentity Online (TransUnion) Credit Monitoring services at no charge for two years from the date of enrollment

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov