HackingFinancial ServicesFinanceCustomer Data InvolvedFinancial accountHealth (basic)Identity (basic)Government IDPCIMediumContained

SunSource Borrower, LLC

bd_3579acec59f4d35e · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 4, 2026

Filed

Jun 17, 2026

To disclose

6 weeks

Affected

193state residents only

Linked

2 filings

Confidence

65%

Full breach record for SunSource Borrower, LLC →

SunSource Borrower, LLC disclosed a data breach in Massachusetts affecting individuals whose names and additional data elements were accessed by an unauthorized third party between March 31 and April 5, 2026. The company engaged forensic experts, confirmed network security, and offered two years of complimentary identity monitoring services.

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Massachusetts clock⏱ MA AG >30d6 weeks discovery → filing

Incident timeline

undetected · 34 days

discovery → filing · 6 weeks / 44 days

Mar 31, 2026

Begins

May 4, 2026

Discovered

Jun 17, 2026

Filed

vs. sector median

2 wks faster

This filing is one of 2 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Nebraska State AGbd_b14fa02f719f723b2026-06-16 · +1dVerified

Name: SunSource Borrower, LLC
norm: sunsource borrower

Name: SunSource Borrower, LLC
norm: sunsource borrower
Industry: Financial Servicesllm

Discovered: May 4, 2026
Breach occurred: Mar 31, 2026 – Apr 5, 2026
Undetected for: 34 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 4, 2026
Affected individuals: 193state-resident count only
Data types: Financial accountHealth (basic)Identity (basic)Government IDPCI
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Initial access: exploit_public_facing

During the incident: Hired an outside third-party forensic expert to investigate the issue and confirm the security of our network
Arranged for you to enroll in a complimentary two-year membership of identity monitoring services
Changes made: Reviewing our technical and security safeguards
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(44 days from discovery to filing)
Compliance flags: MA AG >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Nebraska State AGJun 16 · first

Massachusetts State AG+1d · 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.mass.gov/doc/2026-988-sunsource-borrower-llc-sunsource/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 17, 2026
Raw hash: 424d6f9ea13653a1fc8e82d1c608e5513221f500b73d55f1c7340ae5e174ad23

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entitySunSource Borrower, LLC

Victim entitySunSource Borrower, LLC

Incidentdiscovered May 4, 2026

Stated responseHired an outside third-party forensic expert to investigate the issue and confirm the security of our network

ComplianceMA AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov