HackingGovernment IDIdentity (basic)Financial accountMediumContained

MBE CPAs

bd_2ba5a68ad1b6896c · schema v1 · pii pii-v2

Severity

Medium

Discovered

Apr 18, 2024

Filed

May 13, 2025

To disclose

—

Affected

9state residents only

Linked

7 filings

Confidence

67%

Full breach record for MBE CPAs →2 incidents on file

MBE CPAs, LLP, an accounting firm in Baraboo, Wisconsin, issued a supplemental data breach notice to the Nebraska Attorney General on May 13, 2025. The incident was discovered on April 18, 2024, when unusual network activity was detected. An unauthorized actor accessed files containing names, SSNs, bank account info, and health insurance data. Nine Nebraska residents were newly identified and notified. MBE engaged forensic investigators, disconnected the network, and implemented security enhancements including MFA and Sentinel One monitoring. Credit monitoring was offered to affected individuals.

J jump to incidentP pin to compareR raw source

Incident timeline

Apr 18, 2024

Discovered

May 13, 2025

Filed

This filing is one of 7 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (6) · sorted by filing gap

Massachusetts State AGbd_6f7b298888802b3b2025-05-13Verified
Montana State AGbd_cda94f21ce7d38d52025-05-13Candidate
New Hampshire State AGbd_a22a32d5848a8d412025-05-19 · +6dVerified
Nebraska State AGbd_2b4e0c5dd8dc981d2025-05-28 · +15dVerified

Show 2 more filings ↓up to 27d gap

New Hampshire State AGbd_0854a7d7c693b5192025-06-06 · +24dVerified
Maine State AGbd_d5c9e4424e2ef5592025-06-09 · +27dVerified

Name: Wilson, Elser, Moskowitz, Edelman & Dicker LLP
norm: wilson elser moskowitz edelman dicker
Domain: wilsonelser.com

Name: MBE CPAs
norm: mbe cpas

Discovered: Apr 18, 2024
Materiality determined: —
Notification sent: May 13, 2025
Affected individuals: 9state-resident count only
Data types: Government IDIdentity (basic)Financial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1119 Automated Collection
Threat actor: External

During the incident: Disconnected all access to the network
Engaged a specialized third-party cybersecurity firm to assist with securing the environment
Engaged a third-party data mining firm to conduct a comprehensive review of the data
Mailed a first wave of notice letters to all its employees
Offering complimentary credit monitoring services
Changes made: Sentinel One/Huntress with a 3-year proactive contract that includes monitoring and alerting
Multifactor authentication for RMM tool and where supported
Software patching
Updated password policies and requirements
Implemented audits for users, group policies, and scheduled tasks
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 · 7 filings · 5 states

View merged incident ↗

Massachusetts State AGMay 13 · first

Montana State AGMay 13 · first

Nebraska State AGMay 13 · first · this page

New Hampshire State AG+6d

Nebraska State AG+15d

New Hampshire State AG+24d

Maine State AG+27d

Pattern: first filing May 13 (MA), last Jun 9 (ME) — a 27-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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/faa31931-37f0-4b3f-bb2b-5019903e5637.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 13, 2025
Raw hash: 9b27445e04c40f948250611db53028378d3f50765e42bf277555959aa589ead4

Linked disclosures

Regulatory filings (6) · sorted by filing gap

Reporting entityWilson, Elser, Moskowitz, Edelman & Dicker LLP

Victim entityMBE CPAs

Incidentdiscovered Apr 18, 2024

Stated responseDisconnected all access to the network

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancenebraska.gov