HackingHealthcareHealthcareCustomer Data InvolvedIdentity (basic)MediumContained

Chiesi USA, Inc.

bd_30e0baca8a783e6a · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 28, 2025

Filed

Dec 22, 2025

To disclose

17 weeks

Affected · nationwide

1,8351 in this filing

Linked

5 filings

Confidence

66%

Full breach record for Chiesi USA, Inc. →

Chiesi USA, Inc. reported an external system breach (hacking) occurring on June 23, 2025, discovered on August 28, 2025. The incident affected 1,835 individuals, including 1 Maine resident. Compromised data included names combined with [Extra1]. Chiesi engaged third-party cybersecurity specialists, secured its environment, and provided 24 months of Experian credit monitoring and identity restoration services to affected individuals.

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Maine clockDiscovered Aug 28, 2025 → Filed with AG Dec 22, 2025116d ✗ ME AG >90d17 weeks 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 · 66 days

discovery → filing · 17 weeks / 116 days

Jun 23, 2025

Begins

Aug 28, 2025

Discovered

Dec 22, 2025

Filed

vs. sector median

+5 wks slower

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

New Hampshire State AGbd_10b714aa1a2aa7452025-12-22Verified
Nebraska State AGbd_6b4dc670fb369d6a2025-12-22Verified
Massachusetts State AGbd_bb041de9a9e094f92025-12-22Verified
Vermont State AGbd_e7cc2b535ec681302025-12-22Verified

Name: Chiesi USA, Inc.
norm: chiesi usa

Name: Chiesi USA, Inc.
norm: chiesi usa
Industry: Healthcarellm

Discovered: Aug 28, 2025
Breach occurred: Jun 23, 2025
Undetected for: 66 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 22, 2025
Affected individuals: 1,835state + nationwide
Data types: Identity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Regulator citations: Filed notification with Maine Attorney General
Initial access: exploit_public_facing

During the incident: Secured our environment
Completed our investigation in partnership with third-party cybersecurity specialists
Implemented additional technical safeguards
Providing 24 months of credit monitoring and identity restoration services through Experian
Changes made: Implemented additional technical safeguards to further enhance the security of our systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 17 weeks(116 days from discovery to filing)
Compliance flags: ME AG >90d · 116d
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: Aug 28, 2025
→ Filed with AG: Dec 22, 2025
116d 90 days ME AG >90d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Aug 28, 2025 → Filed with AG: Dec 22, 2025	116d	90 days	ME AG >90d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

New Hampshire State AGDec 22 · first

Nebraska State AGDec 22 · first

Massachusetts State AGDec 22 · first

Vermont State AGDec 22 · first

Maine State AGDec 22 · first · this page

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/f8199e2d-10d1-43c9-8767-de857ffbe8a0.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 22, 2025
Raw hash: 4087e82b33350ee0b447d7e9d26828fb6973d0c3ac72472b4f3c70dc98a04842

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityChiesi USA, Inc.

Victim entityChiesi USA, Inc.

Incidentdiscovered Aug 28, 2025

Stated responseSecured our environment

ComplianceME AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov