HackingRetail & ConsumerRetailStolen CredentialsCustomer Data InvolvedPIIIdentity (basic)LowResolved

CORNERSTONE BUILDING BRANDS, INC.

bd_c14cf158c86f1770 · schema v1 · pii pii-v1

Severity

Low

Discovered

Apr 2, 2019

Filed

Sep 11, 2019

To disclose

23 weeks

Affected

7state residents only

Linked

4 filings

Confidence

65%

Full breach record for CORNERSTONE BUILDING BRANDS, INC. →3 incidents on file

Cornerstone Building Brands, Inc. notified Montana residents that an unauthorized person accessed two employees' email accounts between April 1-2, 2019. The incident may have exposed personal information. The company engaged a cybersecurity firm, secured accounts, and offered one year of free identity monitoring via Kroll.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 1 days

discovery → filing · 23 weeks / 162 days

Apr 1, 2019

Begins

Apr 2, 2019

Discovered

Sep 11, 2019

Filed

vs. sector median

+16 wks slower

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

California State AGbd_387bdc6cec92f2062019-09-11Verified
Massachusetts State AGbd_b2d3a9294f08d9a82019-09-11Verified
New Hampshire State AGbd_72b5212b6bcca4aa2019-09-10 · +1dVerified

Name: CORNERSTONE BUILDING BRANDS, INC.
norm: cornerstone building brands

Name: CORNERSTONE BUILDING BRANDS, INC.
norm: cornerstone building brands
Industry: Retail & Consumerllm

Discovered: Apr 2, 2019
Breach occurred: Apr 1, 2019 – Apr 2, 2019
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Sep 19, 2019
Affected individuals: 7state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Took steps to secure the accounts
Launched an investigation
A cybersecurity firm was engaged to assist
Conducted a thorough review of the emails and attachments
Arranged for Kroll to provide identity monitoring services at no cost to you for one year
Changes made: Providing additional data-security training to employees
Enhancing existing security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 23 weeks(162 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

New Hampshire State AGSep 10 · first

California State AG+1d

Massachusetts State AG+1d

Montana 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://dojmt.gov/wp-content/uploads/OCP/Consumer-Notice-24.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 11, 2019
Raw hash: 621e0773ac403e814d6085bb284f01683a3c5ebc2e8ddffdf791a5e3039c1a97

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityCORNERSTONE BUILDING BRANDS, INC.

Victim entityCORNERSTONE BUILDING BRANDS, INC.

Incidentdiscovered Apr 2, 2019

Stated responseTook steps to secure the accounts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov