HackingFinancial ServicesFinanceStolen CredentialsSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)Financial accountLowContained

Cornerstone Home Lending

bd_bd351bb6f2364e51 · schema v1 · pii pii-v1

Severity

Low

Discovered

Feb 1, 2023

Filed

Apr 3, 2023

To disclose

9 weeks

Affected

131state residents only

Confidence

66%

Full breach record for Cornerstone Home Lending →2 incidents on file

Cornerstone Home Lending notified Montana residents of a data breach involving a third-party service provider. On February 1, 2023, the provider experienced unauthorized intrusion, accessing borrower data including names, addresses, loan numbers, and bank account numbers. Cornerstone offered complimentary Experian IdentityWorks membership to affected individuals.

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Incident timeline

discovery → filing · 9 weeks / 61 days

Feb 1, 2023

Discovered

Apr 3, 2023

Filed

vs. sector median

on median

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed131 affectedView incident

Name: Cornerstone Home Lending
norm: cornerstone home lending
Domain: houseloan.com

Name: Cornerstone Home Lending
norm: cornerstone home lending
Domain: houseloan.com
Industry: Financial Servicesllm

Discovered: Feb 1, 2023
Materiality determined: —
Notification sent: —
Affected individuals: 131state-resident count only
Data types: Identity (basic)Financial account
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1078 Valid Accounts
Threat actor: External
Initial access: supply_chain

During the incident: Offering complimentary membership to Experian’s IdentityWorks
Conducted own investigation into the information provided to this service provider
Changes made: Vendor implemented changes to better protect data
Vendor undertaking additional efforts to harden environment
Vendor expanding security logging infrastructure
Vendor implementing deployment of additional endpoint and network-based safeguards
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(61 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://dojmt.gov/wp-content/uploads/OCP/Consumer-notification-letter-167.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 3, 2023
Raw hash: c45bc07707a2628927c818fe1b235ef33890066580c18cfbf5de01bd5c8f8d4b

Reporting entityCornerstone Home Lending

Victim entityCornerstone Home Lending

Incidentdiscovered Feb 1, 2023

Stated responseOffering complimentary membership to Experian’s IdentityWorks

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov