HackingFinancial ServicesFinanceStolen CredentialsTargetedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountPHIHealth (basic)HighContained

Langabeer McKernan Burnett & Co.

bd_81d4a9df5676b088 · schema v1 · pii pii-v1

Severity

High

Discovered

Aug 15, 2025

Filed

Sep 11, 2025

To disclose

27 days

Affected

1,364state residents only

Linked

3 filings

Confidence

71%

Full breach record for Langabeer McKernan Burnett & Co. →

Langabeer McKernan Burnett & Co., a tax and accounting firm, disclosed an unauthorized access incident discovered on August 15, 2025. The breach affected 1,364 Washington residents, exposing names, SSNs, driver's licenses, financial account info, and health insurance data. LMB isolated systems, engaged forensic investigators, reset credentials, and offered 12 months of credit monitoring.

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Washington clock✓ WA AG ≤30d27 days discovery → filing

⚠ occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Incident timeline

discovery → filing · 27 days

Aug 15, 2025

Begins

Aug 15, 2025

Discovered

Sep 11, 2025

Filed

vs. sector median

5 wks faster

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Montana State AGbd_15f88e6d809708922025-09-11Candidate
Indiana State AGbd_f95fa7f4a16c6e092025-09-11Verified

Name: Wilson Elser Moskowitz Edelman and Dicker LLP
norm: wilson elser moskowitz edelman dicker

Name: Langabeer McKernan Burnett & Co.
norm: langabeer mckernan burnett
Industry: Financial Servicesllm

Discovered: Aug 15, 2025
Breach occurred: Aug 15, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 11, 2025
Affected individuals: 1,364state-resident count only
Data types: Identity (basic)Government IDFinancial accountPHIHealth (basic)
Data elements: NameSocial Security numberDriver's licence numberFinancial account numberDate of birthHealth insurance ID
WA-stated cause: Unauthorized Access
WA-stated duration: lifecycle 0dexposure 0d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified Washington Attorney General
Initial access: valid_credentials

During the incident: Isolated the affected systems
Engaged a specialized third-party cybersecurity firm to assist with securing the environment, as well as, to conduct a comprehensive forensic investigation
Disconnected all access to our network
Changed administrative credentials
Restored operations in a safe and secure mode
Enhanced the security measures
Informed our law firm
Offered twelve (12) months of complimentary credit monitoring and identity theft restoration services through TransUnion
Changes made: Enhanced the security measures
Took steps and will continue to take steps to mitigate the risk of future harm
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 27 days(27 days from discovery to filing)
Compliance flags: WA AG ≤30d
Discovery-date grounding: occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Montana State AGSep 11 · first

Indiana State AGSep 11 · first

Washington State AGSep 11 · 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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA34635.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 11, 2025
Raw hash: 3a8c84f5badcc4746f2cd90bebeda9099670fb43dc22d1cd6b64be2b1cb4909c

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityWilson Elser Moskowitz Edelman and Dicker LLP

Victim entityLangabeer McKernan Burnett & Co.

Incidentdiscovered Aug 15, 2025

Stated responseIsolated the affected systems

ComplianceWA AG ≤30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com