HackingHealthcareHealthcareSupply Chain (3P Vendor)Business Associate (HIPAA)Customer Data InvolvedPHIIdentity (basic)Government IDMediumContained

HealthFirst Bluegrass

bd_11f30faad6493805 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Dec 18, 2025

Filed

Aug 1, 2026

To disclose

—

Affected

Not disclosed

Confidence

64%

Full breach record for HealthFirst Bluegrass →4 incidents on file

Healthfirst Bluegrass, Inc. notified residents of a security incident at its third-party vendor, Aesto LLC, a healthcare data migration and archiving service provider. An unauthorized actor accessed Aesto's AWS infrastructure between December 2 and December 18, 2025. Aesto discovered the incident on December 18, 2025. Affected data includes full names and potentially Social Security numbers (indicated by IRS IP PIN advice). The incident is contained. Healthfirst Bluegrass is offering 24 months of credit monitoring and identity theft protection. Rhode Island reported 6 affected residents; total Massachusetts count not explicitly stated in the provided text.

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Incident timeline

undetected · 16 days

Dec 2, 2025

Begins

Dec 18, 2025

Discovered

Aug 1, 2026

Filed

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

Name: Healthfirst Bluegrass, Inc
norm: healthfirst bluegrass

Name: HealthFirst Bluegrass
norm: healthfirst bluegrass
Industry: Healthcarellm

Discovered: Dec 18, 2025
Breach occurred: Dec 2, 2025 – Dec 18, 2025
Undetected for: 16 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 26, 2026
Affected individuals: Not disclosed
Data types: PHIIdentity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Third party: via Aesto LLC

During the incident: Commenced a prompt and thorough investigation
Worked very closely with external cybersecurity professionals experienced in handling these types of incidents
Conducted extensive forensic investigation and manual document review
Notified Covered Entities with impacted information of the incident
Set up a dedicated and confidential toll-free response line to respond to questions
Changes made: Offering complimentary credit monitoring and identity theft protection services, including a $1,000,000 identity theft insurance policy, at no charge
Providing proactive fraud assistance through Cyberscout
Continually evaluate and modify practices and internal controls to enhance the security and privacy of personal information
Source: Quoted from the filing itself, not independently verified.

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://www.mass.gov/doc/2026-1442-healthfirst-bluegrass-inc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 1, 2026
Raw hash: 82ad1faf015808a780f6616f0de2e6ff197915f07a21e3c3e226df4f82c291a9

Reporting entityHealthfirst Bluegrass, Inc

Victim entityHealthFirst Bluegrass

Incidentdiscovered Dec 18, 2025

Stated responseCommenced a prompt and thorough investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov