HackingProfessional ServicesProfessional ServicesStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDHealth (basic)MediumContained

Lewis Baach Kaufmann Middlemiss PLLC

bd_63ed346aba68a33d · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 13, 2025

Filed

Apr 29, 2026

To disclose

—

Affected

2state residents only

Linked

4 filings

Confidence

66%

Full breach record for Lewis Baach Kaufmann Middlemiss PLLC →

Lewis Baach Kaufmann Middlemiss PLLC (LBKM) notified the Nebraska Attorney General of a cybersecurity incident affecting two Nebraska residents. LBKM, a law firm, identified suspicious activity on August 13, 2025, determining an unknown actor accessed internal systems between August 2 and August 10, 2025. The breach exposed names, dates of birth, Social Security numbers, and medical information. LBKM notified federal law enforcement, engaged outside counsel, and began notifying affected individuals on February 4, 2026, offering 12 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d

Incident timeline

undetected · 11 days

Aug 2, 2025

Begins

Aug 13, 2025

Discovered

Apr 29, 2026

Filed

This filing is one of 4 about the same incident.View merged incident

A leak claim by cephalus about this victim predates this filing by 245 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitecephalusbd_874e0c804651bbbe2025-08-26 · +245dVerified

Regulatory filings (2) · sorted by filing gap

Massachusetts State AGbd_185601dfba19cceb2026-04-29Verified by operator
Indiana State AGbd_35dcf19b1e14be5e2026-04-29Verified

Name: Lewis Baach Kaufmann Middlemiss PLLC
norm: lewis baach kaufmann middlemiss
Domain: lbkmlaw.com

Name: Lewis Baach Kaufmann Middlemiss PLLC
norm: lewis baach kaufmann middlemiss
Domain: lbkmlaw.com
Industry: Professional Servicesllm

Discovered: Aug 13, 2025
Breach occurred: Aug 2, 2025 – Aug 10, 2025
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 4, 2026
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDHealth (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: providing written notice of this incident on behalf of third parties to relevant state regulators
Initial access: valid_credentials

During the incident: Took steps to secure its systems and launched an investigation, with the assistance of outside counsel and third-party consultants
Notified federal law enforcement regarding the event
Providing access to credit monitoring services for twelve (12) months, through Epiq, to individuals whose personal information was potentially affected by this incident, at no cost to these individuals
Providing affected individuals with guidance on how to better protect against identity theft and fraud
Changes made: Working to implement additional safeguards and training to its employees
Source: Quoted from the filing itself, not independently verified.

Compliance flags: Leak >180d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Massachusetts State AGApr 29 · first

Indiana State AGApr 29 · first

Nebraska State AGApr 29 · 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://nebraska.gov/ago/data-breach/documents/031d067e-303f-4f6e-b0cd-2a584880120d.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 29, 2026
Raw hash: ffe8f01ab04478dcaf1c733b589572243782a54b9e02c0c28c0509146979b3c5

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · sorted by filing gap

Reporting entityLewis Baach Kaufmann Middlemiss PLLC

Victim entityLewis Baach Kaufmann Middlemiss PLLC

Incidentdiscovered Aug 13, 2025

Stated responseTook steps to secure its systems and launched an investigation, with the assistance of outside counsel and third-party consultants

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancenebraska.gov