HackingProfessional ServicesProfessional ServicesData ExfiltratedCustomer Data InvolvedDelayed DiscoveryIdentity (basic)LowResolved

EISNER ADVISORY GROUP LLC

bd_ed6f19b468a372e9 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 1, 2023

Filed

Apr 8, 2025

To disclose

20 months

Affected

Not disclosed

Linked

12 filings

Confidence

65%

Full breach record for EISNER ADVISORY GROUP LLC →

Eisner Advisory Group LLC notified the California Attorney General of an incident where an unknown actor gained unauthorized access to files between September 4 and September 9, 2023. The company became aware of suspicious activity in September 2023. In February 2025, the company completed its review and determined that affected individuals' names and other personal information were involved. The investigation is concluded. The company notified regulators and law enforcement and is offering credit monitoring services.

J jump to incidentP pin to compareR raw source

California clockDiscovered Sep 1, 2023 → Notified Apr 8, 2025585d ✗ CA 60-day late20 months discovery → filing

Incident timeline

Sep 4, 2023

Begins

Apr 8, 2025

Filed

vs. sector median

+65 wks slower

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
Nebraska State AGbd_bf58b4074b8bdb072025-04-08Verified
Massachusetts State AGbd_c5bece9672884b592025-04-08Verified
Montana State AGbd_e35702ee8e886a3f2025-04-08Verified
Indiana State AGbd_ea112341cfa5a4d92025-04-08Verified
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 1, 2023
Breach occurred: Sep 4, 2023 – Sep 9, 2023
Materiality determined: —
Notification sent: Apr 8, 2025
Affected individuals: Not disclosed
Data types: Identity (basic)
Attack vector: Unknown
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified state and industry regulators as required

During the incident: Took immediate steps to investigate
Notified state and industry regulators as required
Notified law enforcement of this incident
Offering complimentary access to credit monitoring services through IDX
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 20 months(585 days from discovery to filing)
Compliance flags: CA 60-day late · 585d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Sep 1, 2023
→ Notified: Apr 8, 2025
585d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Sep 1, 2023 → Notified: Apr 8, 2025	585d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

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

Nebraska State AGApr 8 · first

Massachusetts State AGApr 8 · first

Montana State AGApr 8 · first

Indiana State AGApr 8 · first

Maine State AGApr 8 · first

California 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://oag.ca.gov/ecrime/databreach/reports/sb24-601126
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: 99bf8563aee558749182b633893596a5641af227294329d895509ca2a41026e1

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityEISNER ADVISORY GROUP LLC

Victim entityEISNER ADVISORY GROUP LLC

Incidentdiscovered Sep 1, 2023

Stated responseTook immediate steps to investigate

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov