HackingGovernmentGovernmentVulnerability ExploitCapture Stored DataData ExfiltratedCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDFinancial accountFinancial credentialsHealth (basic)HighContained

The Town of Chester

bd_3855e06eac1d88be · schema v1 · pii pii-v1

Severity

High

Discovered

Aug 11, 2025

Filed

Sep 5, 2025

To disclose

25 days

Affected · nationwide

1,2244 in this filing

Linked

5 filings

Confidence

65%

Full breach record for The Town of Chester →

The Town of Chester (MA) reported an external system breach (hacking) occurring between April 9 and April 29, 2025, discovered on August 11, 2025. Approximately 1,224 individuals were affected, including 4 Maine residents. Compromised data included names, SSNs, driver's licenses, financial account numbers, and PHI. The Town engaged forensic specialists and legal counsel, and provided 24 months of credit monitoring to affected individuals. Notification was sent on September 5, 2025.

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Maine clockDiscovered Aug 11, 2025 → Filed with AG Sep 5, 202525d ✓ ME AG ≤30d25 days discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 124 days

discovery → filing · 25 days

Apr 9, 2025

Begins

Aug 11, 2025

Discovered

Sep 5, 2025

Filed

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Massachusetts State AGbd_0a10671fcc18b6f42025-09-05Verified
Vermont State AGbd_5d80778b97c5b51e2025-09-05Verified
New Hampshire State AGbd_69809c87beb5fa422025-09-05Verified
Illinois State AGbd_1141dd060e2bd59b2025-09-01 · +4dVerified

Name: The Town of Chester
norm: the town of chester

Name: The Town of Chester
norm: the town of chester
Industry: Governmentllm

Discovered: Aug 11, 2025
Breach occurred: Apr 9, 2025 – Apr 29, 2025
Undetected for: 124 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 5, 2025
Affected individuals: 1,224state + nationwide
Data types: Identity (basic)Government IDFinancial accountFinancial credentialsHealth (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1119 Automated CollectionT1074 Data Staged
Threat actor: ExternalFinancial
Regulator citations: Filed notification with the Maine Attorney General
Initial access: exploit_public_facing

During the incident: Retained legal counsel and third-party forensic specialists to investigate the unusual activity
Began a comprehensive review of the data set to determine what sensitive and/or personal information was impacted
Notified potentially impacted individuals
Provided access to Single Bureau Credit Monitoring/Single Bureau Credit Report/Single Bureau Credit Score services at no charge for 24 months
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 25 days(25 days from discovery to filing)
Compliance flags: ME AG ≤30d · 25d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Aug 11, 2025
→ Filed with AG: Sep 5, 2025
25d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Aug 11, 2025 → Filed with AG: Sep 5, 2025	25d	30 days	ME AG ≤30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Illinois State AGSep 1 · first

Massachusetts State AG+4d

Vermont State AG+4d

New Hampshire State AG+4d

Maine State AG+4d · 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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/52e88a0f-a9e0-4873-875a-51735204bfb4.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 5, 2025
Raw hash: 91a68803a014793eca804b8a6d55563e8c8f0d508452765320c05e30d0cbf593

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityThe Town of Chester

Victim entityThe Town of Chester

Incidentdiscovered Aug 11, 2025

Stated responseRetained legal counsel and third-party forensic specialists to investigate the unusual activity

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov