HackingHealthcareHealthcareData ExfiltratedCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDPHIHealth (basic)MediumContained

MCBS, LLC

bd_8f3ea50c0a24e40c · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 25, 2025

Filed

Jun 29, 2026

To disclose

40 weeks

Affected

135state residents only

Linked

7 filings

Confidence

66%

Full breach record for MCBS, LLC →2 incidents on file

MCBS, LLC notified the New Hampshire Attorney General of a security incident affecting 135 NH residents. Unauthorized access occurred between Sept 22-26, 2025, discovered Sept 25, 2025. Personal and health data (SSN, DOB, medical info) were potentially accessed. MCBS engaged forensic investigators, contained the breach, and offered 12 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d40 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 3 days

discovery → filing · 40 weeks / 277 days

Sep 22, 2025

Begins

Sep 25, 2025

Discovered

Jun 29, 2026

Filed

vs. sector median

+27 wks slower

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

A leak claim by pear about this victim predates this filing by 277 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitepearbd_fbca2f8d470dced22025-09-25 · +277dVerified by operator

Regulatory filings (5) · sorted by filing gap

Texas State AGbd_51bebdfc54a78a9b2026-06-30 · +1dVerified
South Carolina State AGbd_bf3c11705b24a8a62026-07-01 · +2dVerified
Illinois State AGbd_bf98d272641890612026-07-01 · +2dVerified
California State AGbd_32aaf81428502adc2026-06-26 · +3dVerified by operator

Show 1 more filing ↓up to 3d gap

HHS OCRbd_8ed31a4b32add53a2026-06-26 · +3dVerified by operator

Name: MCBS, LLC
norm: mcbs
Domain: mcbs.com

Name: MCBS, LLC
norm: mcbs
Domain: mcbs.com
Industry: Healthcarellm

Discovered: Sep 25, 2025
Breach occurred: Sep 22, 2025 – Sep 26, 2025
Undetected for: 3 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 26, 2026
Affected individuals: 135state-resident count only
Data types: Identity (basic)Government IDPHIHealth (basic)
Data elements: Social Security numberDate of birthMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Regulator citations: Notified New Hampshire Office of the Attorney General, Consumer Protection Bureau
Initial access: exploit_public_facing

During the incident: Engaged external cybersecurity professionals
Conducted forensic investigation
Conducted comprehensive document review
Notified potentially impacted individuals
Provided written notification to the Attorney General's office
Offered 12-month complimentary credit monitoring service
Changes made: Continually evaluates and modifies practices to enhance security and privacy
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 40 weeks(277 days from discovery to filing)
Compliance flags: Leak >180d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 6 states

View merged incident ↗

California State AGJun 26 · first

HHS OCRJun 26 · first

New Hampshire State AG+3d · this page

Texas State AG+4d

South Carolina State AG+5d

Illinois State AG+5d

Pattern: first filing Jun 26 (CA), last Jul 1 (IL) — a 5-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://mm.nh.gov/files/uploads/doj/remote-docs/mcbs-20260629.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 29, 2026
Raw hash: 0efc5a04a5e652e0adf4caf6998906a1ea6dcc29d7d6d570f02598d475b5567d

Linked disclosures

Ransomware claims (1)

Regulatory filings (5) · sorted by filing gap

Reporting entityMCBS, LLC

Victim entityMCBS, LLC

Incidentdiscovered Sep 25, 2025

Stated responseEngaged external cybersecurity professionals

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov