HackingProfessional ServicesProfessional ServicesStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Greater Boston Chamber of Commerce

bd_4364ddf83ec140b3 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 11, 2025

Filed

Oct 21, 2025

To disclose

6 weeks

Affected · nationwide

1831 in this filing

Linked

4 filings

Confidence

67%

Full breach record for Greater Boston Chamber of Commerce →

Greater Boston Chamber of Commerce reported a data breach affecting 183 individuals, including 1 Maine resident. Unauthorized access occurred on September 10, 2025, via compromised credentials at third-party vendors Bill.com and ADP. Personal information including names, addresses, SSNs, and bank account numbers may have been accessed. The incident was discovered on September 11, 2025. Law enforcement was notified, and affected individuals received credit monitoring services.

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Maine clockDiscovered Sep 11, 2025 → Filed with AG Oct 21, 202540d ⏱ ME AG >30d6 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 · 1 days

discovery → filing · 6 weeks / 40 days

Sep 10, 2025

Begins

Sep 11, 2025

Discovered

Oct 21, 2025

Filed

vs. sector median

13 wks faster

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

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Massachusetts State AGbd_47e874e840d5d6d02025-10-21Verified
Vermont State AGbd_a21aa6d50a2ae90d2025-10-21Verified
Massachusetts State AGbd_3360a0ce60c9ae962026-02-05 · +107dVerified

Name: NUTTER, MCCLENNEN & FISH, LLP
norm: nutter mcclennen fish

Name: Greater Boston Chamber of Commerce
norm: greater boston chamber of commerce
Industry: Professional Servicesllm

Discovered: Sep 11, 2025
Breach occurred: Sep 10, 2025
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Oct 21, 2025
Affected individuals: 183state + nationwide
Data types: Identity (basic)Government IDFinancial account
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: Notified Maine Attorney General
Initial access: valid_credentials

During the incident: Contacted vendors and locked unauthorized users out of accounts
Began an investigation
Notified law enforcement
Engaged a security expert to understand the scope of the incident and help recover
Changes made: Made immediate enhancements to systems, security and practices
Engaged appropriate experts to conduct a full review of the incident
Ensured enhanced security protocols are in place going forward
Provided 24 months of credit monitoring services through Cyberscout
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(40 days from discovery to filing)
Compliance flags: ME AG >30d · 40d
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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Sep 11, 2025
→ Filed with AG: Oct 21, 2025
40d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Sep 11, 2025 → Filed with AG: Oct 21, 2025	40d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 3 states

View merged incident ↗

Massachusetts State AGOct 21 · first

Vermont State AGOct 21 · first

Maine State AGOct 21 · first · this page

Massachusetts State AG+107d

Pattern: first filing Oct 21 (MA), last Feb 5 (MA) — a 107-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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/960f1894-92dc-4a09-b658-90a06074a4f1.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 21, 2025
Raw hash: 532c54b4e247e179f41504138e389b2889b0151029bc68c13bed4c281677bf00

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityNUTTER, MCCLENNEN & FISH, LLP

Victim entityGreater Boston Chamber of Commerce

Incidentdiscovered Sep 11, 2025

Stated responseContacted vendors and locked unauthorized users out of accounts

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov