HackingHealthcareHealthcareData ExfiltratedCustomer Data InvolvedSupply Chain (3P Vendor)Identity (basic)Government IDHealth (basic)MediumContained

Everside Health

bd_67f13a4222e41030 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 26, 2026

Filed

Jul 31, 2026

To disclose

5 weeks

Affected

442state residents only

Linked

6 filings

Confidence

66%

Full breach record for Everside Health →3 incidents on file

New Hampshire Attorney General notice regarding a security incident at Aesto, LLC, a third-party vendor for Everside Health. Aesto, which provides healthcare data migration services, experienced unauthorized access to AWS infrastructure between Dec 2-18, 2025. Approximately 442 NH residents' PII (names, DOB, SSN, MRNs) was potentially accessed. Notification letters were mailed on July 31, 2026, offering 12 months of credit monitoring.

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Incident timeline

undetected · 206 days

discovery → filing · 5 weeks / 35 days

Dec 2, 2025

Begins

Jun 26, 2026

Discovered

Jul 31, 2026

Filed

vs. sector median

6 wks faster

This filing is one of 6 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

California State AGbd_3a91ce22cef72ff32026-07-31Candidate
New Hampshire State AGbd_7afae1cfba7459a52026-07-31Verified
Vermont State AGbd_ed89224a3d3fa39d2026-07-31Verified
Massachusetts State AGbd_efc058e9ea799e382026-07-31Candidate

Show 1 more filing ↓up to 5d gap

Oregon State AGbd_ffdc3411341bf72d2026-08-05 · +5dVerified

Name: Everside Health
norm: everside health

Name: Everside Health
norm: everside health
Industry: Healthcarellm

Discovered: Jun 26, 2026
Breach occurred: Dec 2, 2025 – Dec 18, 2025
Undetected for: 206 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 31, 2026
Affected individuals: 442state-resident count only
Data types: Identity (basic)Government IDHealth (basic)
Data elements: Social Security numberDate of birthMedical information
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain Compromise
Threat actor: External
Third party: via Aesto, LLC

During the incident: Commenced an investigation with support from cybersecurity professionals
Took steps to contain the incident
Established a dedicated, toll-free call center to answer any questions
Began mailing notification letters to affected individuals via USPS First-Class mail
Changes made: Continue to evaluate and modify its practices and internal controls to enhance the security and privacy of personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(35 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 5 states

View merged incident ↗

California State AGJul 31 · first

New Hampshire State AGJul 31 · first

Vermont State AGJul 31 · first

Massachusetts State AGJul 31 · first

New Hampshire State AGJul 31 · first · this page

Oregon State AG+5d

Pattern: first filing Jul 31 (CA), last Aug 5 (OR) — 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/everside-health-20260731.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 31, 2026
Raw hash: be1af2479d45e6fad80a9da59817617bddfce419ddda9fb86a6b78126246837a

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityEverside Health

Victim entityEverside Health

Incidentdiscovered Jun 26, 2026

Stated responseCommenced an investigation with support from cybersecurity professionals

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov