HackingProfessional ServicesProfessional ServicesStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Greater Boston Chamber of Commerce

bd_a21aa6d50a2ae90d · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 11, 2025

Filed

Oct 21, 2025

To disclose

6 weeks

Affected

Not disclosed

Linked

4 filings

Confidence

66%

Full breach record for Greater Boston Chamber of Commerce →

Greater Boston Chamber of Commerce notified consumers on Oct 21, 2025, of a Sept 10, 2025 incident where an unauthorized third party accessed vendor accounts via stolen credentials. Data potentially exposed included names, addresses, SSNs, and bank account numbers. The organization engaged experts, enhanced security, and offered 24 months of credit monitoring. No evidence of misuse was found.

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Vermont clock⏱ VT AG >14 bday6 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

Maine State AGbd_4364ddf83ec140b32025-10-21Candidate
Massachusetts State AGbd_47e874e840d5d6d02025-10-21Verified
Massachusetts State AGbd_3360a0ce60c9ae962026-02-05 · +107dVerified

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

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: Not disclosed
Data types: Identity (basic)Government IDFinancial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Made immediate enhancements to our systems, security and practices
Engaged appropriate experts to assist us in conducting a full review of the incident
Providing you with access to Single Bureau Credit Monitoring/Single Bureau Credit Report/Single Bureau Credit Score services at no charge
Providing you with proactive fraud assistance
Changes made: Enhanced security protocols are in place going forward
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(40 days from discovery to filing)
Compliance flags: VT AG >14 bday
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 · 4 filings · 3 states

View merged incident ↗

Maine State AGOct 21 · first

Massachusetts State AGOct 21 · first

Vermont State AGOct 21 · first · this page

Massachusetts State AG+107d

Pattern: first filing Oct 21 (ME), 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://ago.vermont.gov/document/2025-10-21-greater-boston-chamber-commerce-data-breach-notice-consumers
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: 6912e44bc80509008e78f73e5869672442883aac5e78a74b77a337f1a30d85a4

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityGreater Boston Chamber of Commerce

Victim entityGreater Boston Chamber of Commerce

Incidentdiscovered Sep 11, 2025

Stated responseMade immediate enhancements to our systems, security and practices

ComplianceVT AG >14 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov