HackingProfessional ServicesProfessional ServicesCustomer Data InvolvedData ExfiltratedIdentity (basic)Government IDPIICriticalContained

GERSON LEHRMAN GROUP, INC.

bd_40f515c14974b085 · schema v1 · pii pii-v1

Severity

Critical

Discovered

Feb 5, 2024

Filed

Mar 12, 2024

To disclose

5 weeks

Affected · nationwide

152,621338 in this filing

Linked

10 filings

Confidence

67%

Full breach record for GERSON LEHRMAN GROUP, INC. →2 incidents on file

Gerson Lehrman Group, Inc. reported an external system breach that occurred on November 12, 2023, and was discovered on February 5, 2024. The breach affected 152,621 individuals, compromising their names and Social Security numbers. Gerson Lehrman Group began notifying the impacted individuals on March 12, 2024, and offered 12 months of identity monitoring services.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Feb 5, 2024 → Filed with AG Mar 12, 202436d ⏱ ME AG >30d5 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 · 85 days

discovery → filing · 5 weeks / 36 days

Nov 12, 2023

Begins

Feb 5, 2024

Discovered

Mar 12, 2024

Filed

vs. sector median

14 wks faster

This filing is one of 10 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (9) · sorted by filing gap

Oregon State AGbd_30321db2548f181f2024-03-12Candidate
South Carolina State AGbd_5ed22e7a141700a52024-03-12Verified
California State AGbd_690a00405f09498b2024-03-12Verified
Montana State AGbd_6a5c413bc2a8a1102024-03-12Verified by operator

Show 5 more filings ↓up to 1d gap

Indiana State AGbd_7401d65ed4c18ce72024-03-12Verified
Vermont State AGbd_8477b7863a3765852024-03-12Verified
New Hampshire State AGbd_956c9ae2eb034ab42024-03-12Verified
Washington State AGbd_a6d110a2d0e028302024-03-12Verified
Massachusetts State AGbd_c965169beffea6d02024-03-13 · +1dVerified

Name: GERSON LEHRMAN GROUP, INC.
norm: gerson lehrman

Name: GERSON LEHRMAN GROUP, INC.
norm: gerson lehrman
Industry: Professional Servicesllm

Discovered: Feb 5, 2024
Breach occurred: Nov 12, 2023
Undetected for: 85 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 12, 2024
Affected individuals: 152,621state + nationwide
Data types: Identity (basic)Government IDPII
Data elements: Social Security number
Attack vector: Unauthorized Access
Threat actor: External

During the incident: Notified affected individuals in writing
Offered 12 months of identity theft protection services through CyEx Identity Defense Total
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(36 days from discovery to filing)
Compliance flags: ME AG >30d · 36d
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: Feb 5, 2024
→ Filed with AG: Mar 12, 2024
36d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Feb 5, 2024 → Filed with AG: Mar 12, 2024	36d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 10 filings · 10 states

View merged incident ↗

Oregon State AGMar 12 · first

South Carolina State AGMar 12 · first

California State AGMar 12 · first

Montana State AGMar 12 · first

Indiana State AGMar 12 · first

Vermont State AGMar 12 · first

New Hampshire State AGMar 12 · first

Washington State AGMar 12 · first

Maine State AGMar 12 · first · this page

Massachusetts State AG+1d

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-a1252b4f8318/33265961-07d6-49e1-ab43-fa17ca9da3b0.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 12, 2024
Raw hash: 714cb57ee1e13089ec41493719f5bc53ea2cc37612ff7b2e66738a31f892d36c

Linked disclosures

Regulatory filings (9) · sorted by filing gap

Reporting entityGERSON LEHRMAN GROUP, INC.

Victim entityGERSON LEHRMAN GROUP, INC.

Incidentdiscovered Feb 5, 2024

Stated responseNotified affected individuals in writing

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov