AccidentalHealthcareFinancial ServicesHealthcareMisconfigurationData ExfiltratedIdentity (basic)Government IDPIIMediumContained

FIRSTSOURCE HEALTH PLANS AND HEALTHCARE SERVICES, LLC

bd_16a197560ae49228 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Jul 13, 2026

To disclose

—

Affected

4state residents only

Confidence

68%

Full breach record for FIRSTSOURCE HEALTH PLANS AND HEALTHCARE SERVICES, LLC →2 incidents on file

Firstsource Health Plans and Healthcare Services, LLC, a service provider to health insurance clients, disclosed a programming error on its platform that potentially exposed protected health information (PHI) and standalone Social Security numbers. The incident involved unauthorized viewing or access to personally identifiable information (PII) via a platform supporting online document uploads for claims and correspondence. Firstsource engaged an independent forensic firm, which found no evidence of misuse. Affected individuals were offered credit monitoring and notified via state AG notices.

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Incident timeline — partial

? — ?

Breach window unknown

Jul 13, 2026

Filed

—

No filing yet · watching

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed4 affectedView incident

Name: FIRSTSOURCE HEALTH PLANS AND HEALTHCARE SERVICES, LLC
norm: firstsource health plans and healthcare

Name: FIRSTSOURCE HEALTH PLANS AND HEALTHCARE SERVICES, LLC
norm: firstsource health plans and healthcare
Industry: HealthcarellmFinancial Servicesllm

Discovered: —
Materiality determined: —
Notification sent: —
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government IDPII
Data elements: Social Security number
Attack vector: Misconfiguration
MITRE ATT&CK: T1119 Automated Collection

During the incident: Disabled the setting that allowed this information to be accessed
Added additional protections to the related system
Strengthened access controls consistent with security best practices
Updated the system to better control how files and information can be accessed
Added additional safeguards to block attempts to reach information through unauthorized paths
Changed the way the application handles file access so it can only occur through approved processes
Strengthened checks on the system to help ensure only authorized users can make requests
Improved security for system connections and application features
Enhanced session controls, including automatic expiration and sign-out protections
Added stronger checks throughout the application to help prevent unauthorized access to information
Changed passwords, security keys, and other credentials connected to the affected application
Strengthened protections for sensitive information, including when it is stored and when it is transmitted
Added stronger user verification steps for certain file access functions
Engaged an independent forensic firm to review the security of the platform
Changes made: Updated the system to better control how files and information can be accessed
Added additional safeguards to block attempts to reach information through unauthorized paths
Changed the way the application handles file access so it can only occur through approved processes
Strengthened checks on the system to help ensure only authorized users can make requests
Improved security for system connections and application features
Enhanced session controls, including automatic expiration and sign-out protections
Added stronger checks throughout the application to help prevent unauthorized access to information
Changed passwords, security keys, and other credentials connected to the affected application
Strengthened protections for sensitive information, including when it is stored and when it is transmitted
Added stronger user verification steps for certain file access functions
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/2026-1122-firstsource-health-plans-and-healthcare-services-llc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 13, 2026
Raw hash: 04a1c8ca2ad351619ef1d689f7f10c9e37d7fb84455285a8652291bf222d1309

Reporting entityFIRSTSOURCE HEALTH PLANS AND HEALTHCARE SERVICES, LLC

Victim entityFIRSTSOURCE HEALTH PLANS AND HEALTHCARE SERVICES, LLC

IncidentMisconfiguration

Stated responseDisabled the setting that allowed this information to be accessed

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov