HackingEducationEducationData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Mendon-Upton Regional School District

bd_8551cc952e97407f · schema v1 · pii pii-v2

Severity

Medium

Discovered

May 20, 2026

Filed

Sep 28, 2026

To disclose

19 weeks

Affected

1state residents only

Confidence

70%

Full breach record for Mendon-Upton Regional School District →2 incidents on file

Mendon-Upton Regional School District discovered unauthorized access to its network on May 20, 2026. Investigation revealed data was accessed and copied between May 7 and May 20, 2026. One New Hampshire resident was affected, with name, SSN, and financial account number potentially compromised. Forensic investigation was conducted, and credit monitoring was offered.

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Incident timeline

undetected · 13 days

discovery → filing · 19 weeks / 131 days

May 7, 2026

Begins

May 20, 2026

Discovered

Sep 28, 2026

Filed

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1 affectedView incident

Name: Mendon-Upton Regional School District
norm: mendon upton regional school district

Name: Mendon-Upton Regional School District
norm: mendon upton regional school district
Industry: Educationllm

Discovered: May 20, 2026
Breach occurred: May 7, 2026 – May 20, 2026
Undetected for: 13 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 28, 2026
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government IDFinancial account
Attack vector: Unknown
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Notified New Hampshire Attorney General

During the incident: Engaged a specialized cybersecurity firm to conduct a forensic investigation to determine the nature and scope of the Event
Informed its law firm and began identifying the affected individuals in preparation for notice
Offered at least 12 months of complimentary credit monitoring and identity theft restoration services through Cyberscout, a TransUnion company, to all individuals to help protect their identity
Provided guidance on how to better protect against identity theft and fraud, including providing information on how to place a fraud alert and security freeze on one’s credit file, the contact details for the national consumer reporting agencies, information on how to obtain a free credit report, a reminder to remain vigilant for incidents of fraud and identity theft by reviewing account statements and monitoring free credit reports, and the contact details for the Federal Trade Commission
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 19 weeks(131 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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/mendon-upton-regional-school-district-20260928.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 28, 2026
Raw hash: d5dcb3c8b3df8fedad2521a55707c102e8336a2f77878ca558ddb3b8f036d5fd

Reporting entityMendon-Upton Regional School District

Victim entityMendon-Upton Regional School District

Incidentdiscovered May 20, 2026

Stated responseEngaged a specialized cybersecurity firm to conduct a forensic investigation to determine the nature and scope of the Event

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov