HackingProfessional ServicesProfessional ServicesVulnerability ExploitCustomer Data InvolvedIdentity (basic)LowContained

Lyon Real Estate

bd_3e536f8381d828b6 · schema v1 · pii pii-v1

Severity

Low

Discovered

May 4, 2023

Filed

Sep 6, 2023

To disclose

18 weeks

Affected

Not disclosed

Linked

6 filings

Confidence

66%

Full breach record for Lyon Real Estate →

Lyon Real Estate disclosed that an unknown individual accessed its systems via a software vulnerability in a vendor application between April 18, 2023, and May 4, 2023. The company identified suspicious activity on May 4, 2023. Affected data included names and other personal information. Lyon engaged third-party specialists, reviewed impacted files, and is offering credit monitoring services to affected individuals.

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Incident timeline

undetected · 16 days

discovery → filing · 18 weeks / 125 days

Apr 18, 2023

Begins

May 4, 2023

Discovered

Sep 6, 2023

Filed

vs. sector median

1 wks faster

This filing is one of 6 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

New Hampshire State AGbd_3fd1dc88542228202023-09-06Verified
Montana State AGbd_6401fa3db6bda0eb2023-09-06Candidate
Massachusetts State AGbd_8001ac3b78369b472023-09-06Verified
Indiana State AGbd_87467a1e3cbd2a462023-09-06Verified

Show 1 more filing ↓

Maine State AGbd_eabed48a437241c42023-09-06Verified

Name: Lyon Real Estate
norm: lyon real estate

Name: Lyon Real Estate
norm: lyon real estate
Industry: Professional Servicesllm

Discovered: May 4, 2023
Breach occurred: Apr 18, 2023 – May 4, 2023
Undetected for: 16 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Initial access: exploit_public_facing

During the incident: Launched an investigation into the nature and scope of the event with the assistance of third-party subject matter specialists
Undertook a comprehensive review of information stored in the impacted files to determine what information was affected
Conducted a manual review of records to confirm the identities of individuals affected
Offering access to complimentary credit monitoring and identity restoration services through Equifax
Changes made: Reviewing and enhancing information security policies and procedures
Enhancing procedures with respect to the integration and use of third-party software products
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 weeks(125 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 6 states

View merged incident ↗

New Hampshire State AGSep 6 · first

Montana State AGSep 6 · first

Massachusetts State AGSep 6 · first

Indiana State AGSep 6 · first

Maine State AGSep 6 · first

California State AGSep 6 · first · 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://oag.ca.gov/ecrime/databreach/reports/sb24-572927
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 6, 2023
Raw hash: 4fd31f197f9096fd065637dd79898ace708daf4b046f1808a8aaea8b3494568b

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityLyon Real Estate

Victim entityLyon Real Estate

Incidentdiscovered May 4, 2023

Stated responseLaunched an investigation into the nature and scope of the event with the assistance of third-party subject matter specialists

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov