HackingProfessional ServicesProfessional ServicesStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountHealth (basic)PHIMediumResolved

EISNER ADVISORY GROUP LLC

bd_bf58b4074b8bdb07 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Sep 9, 2023

Filed

Apr 8, 2025

To disclose

—

Affected

971state residents only

Linked

12 filings

Confidence

66%

Full breach record for EISNER ADVISORY GROUP LLC →

Eisner Advisory Group LLC notified Nebraska residents that unauthorized access occurred between September 4-9, 2023, affecting 971 individuals. The incident involved the exfiltration of names, SSNs, financial account info, DOB, and medical/health insurance data. Eisner discovered the activity on September 9, 2023, completed its review in February 2025, and sent notifications on April 8, 2025. Response included law enforcement notification, credit monitoring, and enhanced employee training.

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Incident timeline

undetected · 5 days

Sep 4, 2023

Begins

Sep 9, 2023

Discovered

Apr 8, 2025

Filed

This filing is one of 12 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Vermont State AGbd_0e87a3f3a7019a002025-04-08Verified
New Hampshire State AGbd_27e512fd0cdac5572025-04-08Verified
Washington State AGbd_61c9ad8db06a18a32025-04-08Candidate
Iowa State AGbd_9c143312e5d526b82025-04-08Verified

Show 6 more filings ↓

Oregon State AGbd_bd4df5a263203c7d2025-04-08Verified
Massachusetts State AGbd_c5bece9672884b592025-04-08Verified
Montana State AGbd_e35702ee8e886a3f2025-04-08Verified
Indiana State AGbd_ea112341cfa5a4d92025-04-08Verified
California State AGbd_ed6f19b468a372e92025-04-08Verified
Maine State AGbd_f8dee5063c7117622025-04-08Verified

Showing first 10 of 11 linked disclosures.

Name: EISNER ADVISORY GROUP LLC
norm: eisner advisory

Name: EISNER ADVISORY GROUP LLC
norm: eisner advisory
Industry: Professional Servicesllm

Discovered: Sep 9, 2023
Breach occurred: Sep 4, 2023 – Sep 9, 2023
Undetected for: 5 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 8, 2025
Affected individuals: 971state-resident count only
Data types: Identity (basic)Government IDFinancial accountHealth (basic)PHI
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified state and industry regulatorsNotified law enforcement
Initial access: valid_credentials

During the incident: Notified state and industry regulators
Notified law enforcement
Offered 12 months of credit monitoring services through IDX
Provided guidance on protecting against identity theft and fraud
Provided information on placing fraud alerts and security freezes
Provided contact details for national consumer reporting agencies
Provided information on obtaining free credit reports
Encouraged individuals to contact the Federal Trade Commission, state Attorney General, and law enforcement
Provided written notice to relevant state regulators
Provided written notice to the three major credit reporting agencies
Changes made: Implemented additional safeguards and training to employees
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 ↗

Vermont State AGApr 8 · first

New Hampshire State AGApr 8 · first

Washington State AGApr 8 · first

Iowa State AGApr 8 · first

Oregon State AGApr 8 · first

Massachusetts State AGApr 8 · first

Montana State AGApr 8 · first

Indiana State AGApr 8 · first

California State AGApr 8 · first

Maine State AGApr 8 · first

Nebraska State AGApr 8 · first · this page

Cascade drawn from the first 10 linked disclosures of 11 — 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://nebraska.gov/ago/data-breach/documents/31638260-5fc1-4716-93ae-bc1e40f2fe49.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 8, 2025
Raw hash: 9846464080c9a5eba44bc8a8a955460d6b24c6ff27d4e00eaccc24dd6220ac71

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityEISNER ADVISORY GROUP LLC

Victim entityEISNER ADVISORY GROUP LLC

Incidentdiscovered Sep 9, 2023

Stated responseNotified state and industry regulators

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancenebraska.gov