HackingHealthcareCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Financial accountFinancial credentialsLowContained

EISAI INC.

bd_278d9749e3b058b5 · schema v1 · pii pii-v1

Severity

Low

Discovered

Aug 29, 2023

Filed

Oct 2, 2023

To disclose

5 weeks

Affected

13scope not determined

Linked

6 filings

Confidence

65%

Full breach record for EISAI INC. →5 incidents on file

Eisai Inc. experienced an external hacking incident occurring between May 22, 2023, and June 3, 2023. The breach, discovered on August 29, 2023, impacted 13 Maine residents. Compromised data included names along with financial account or credit/debit card numbers and their associated security codes or PINs. The company provided one year of credit monitoring and identity theft protection services to affected individuals.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d5 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 · 99 days

discovery → filing · 5 weeks / 34 days

May 22, 2023

Begins

Aug 29, 2023

Discovered

Oct 2, 2023

Filed

This filing is one of 6 about the same incident.View merged incident

A leak claim by atomsilo about this victim predates this filing by 650 days.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

Indiana State AGbd_205406df7a4d5b0e2023-10-02Verified
Vermont State AGbd_8312ac8b94d224692023-10-02Verified
New Hampshire State AGbd_8ac324a55291e8952023-10-02Verified
Massachusetts State AGbd_cec3ca64f45dce4c2023-10-02Verified

Show 1 more filing ↓

Montana State AGbd_e87b4887774c3dad2023-10-02Verified

Name: EISAI INC.
norm: eisai
Domain: eisai.com

Name: EISAI INC.
norm: eisai
Domain: eisai.com

Discovered: Aug 29, 2023
Breach occurred: May 22, 2023 – Jun 3, 2023
Undetected for: 99 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 2, 2023
Affected individuals: 13scope not determined
Data types: Identity (basic)Financial accountFinancial credentials
Data elements: Financial account number
Attack vector: Unauthorized Access

During the incident: Provided 1 year of credit monitoring and identity theft protection through Equifax
Sent written notification to affected consumers
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(34 days from discovery to filing)
Compliance flags: Leak >180dME AG >30d · 34d
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 29, 2023
→ Filed with AG: Oct 2, 2023
34d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Aug 29, 2023 → Filed with AG: Oct 2, 2023	34d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 6 states

View merged incident ↗

Indiana State AGOct 2 · first

Vermont State AGOct 2 · first

New Hampshire State AGOct 2 · first

Massachusetts State AGOct 2 · first

Montana State AGOct 2 · first

Maine State AGOct 2 · 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/e8c3f241-e9eb-4e6c-830b-f1be6922dad6.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 2, 2023
Raw hash: 2f68c6ebc51aac53485449d7a62cb0a924bf7a34a88cfb304b0f4666bff23cb4

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityEISAI INC.

Victim entityEISAI INC.

Incidentdiscovered Aug 29, 2023

Stated responseProvided 1 year of credit monitoring and identity theft protection through Equifax

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov