Social EngineeringFinancial ServicesFinancePhishingCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Cambridge Investment Research, Inc.

bd_435f2fd83b7684bf · schema v1 · pii pii-v1

Severity

Medium

Discovered

Oct 1, 2024

Filed

Nov 13, 2025

To disclose

—

Affected

4state residents only

Confidence

65%

Full breach record for Cambridge Investment Research, Inc. →

An independent financial advisor (securities offered through Cambridge Investment Research, Inc.) notified the Maryland Attorney General of a data security incident. Unauthorized access to a single email mailbox occurred between September 24 and October 1, 2024, likely via phishing. The incident affected 4 Maryland residents, exposing names, addresses, DOB, SSNs, driver's licenses, and financial account numbers. The advisor engaged forensic reviewers, secured the environment, and offered 12 months of credit monitoring and identity protection services through IDX.

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Incident timeline

undetected · 7 days

Sep 24, 2024

Begins

Oct 1, 2024

Discovered

Nov 13, 2025

Filed

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

Name: Constangy, Brooks, Smith & Prophete, LLP
norm: constangy brooks smith prophete

Name: Cambridge Investment Research, Inc.
norm: cambridge investment research
Industry: financial_services
Industry: Financial Servicesllm

Discovered: Oct 1, 2024
Breach occurred: Sep 24, 2024 – Oct 1, 2024
Undetected for: 7 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jan 9, 2025
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government IDFinancial account
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing Link
Threat actor: ExternalFinancial
Regulator citations: Notified Maryland Attorney General
Initial access: phishing_link

During the incident: Secured its email environment
Launched an investigation
Engaged an independent team to conduct a comprehensive review
Located relevant address information
Prepared services being offered
Provided individuals with information about steps to protect personal information
Offered complimentary credit monitoring and identity protection services through IDX by Zerofox
Implemented additional technical security measures
Changes made: Implemented additional technical security measures throughout the environment
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://oag.maryland.gov/resources-info/SBN%20Documents/2025/ITU-376141.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 13, 2025
Raw hash: 062bb21ca3009c9dbfd0b5e607e0969f9b4622dab4733136ebcce689e79fce7f

Reporting entityConstangy, Brooks, Smith & Prophete, LLP

Victim entityCambridge Investment Research, Inc.

Incidentdiscovered Oct 1, 2024

Stated responseSecured its email environment

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.maryland.gov