HackingProfessional ServicesProfessional ServicesStolen CredentialsCustomer Data InvolvedIdentity (basic)PIILowContained

GRANT THORNTON LLP

bd_17cad5b1f2afa8e1 · schema v1 · pii pii-v1

Severity

Low

Discovered

May 1, 2023

Filed

Sep 19, 2023

To disclose

20 weeks

Affected

Not disclosed

Linked

4 filings

Confidence

65%

Full breach record for GRANT THORNTON LLP →2 incidents on file

Grant Thornton LLP reported that an unauthorized third party gained access to an employee's email account between April 19, 2023, and May 1, 2023. The incident was discovered on May 1, 2023. Affected data included names and other personal information. Grant Thornton engaged a forensic firm, implemented additional technical controls, and offered one year of identity monitoring services via Kroll.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 12 days

discovery → filing · 20 weeks / 141 days

Apr 19, 2023

Begins

May 1, 2023

Discovered

Sep 19, 2023

Filed

vs. sector median

+1 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

Indiana State AGbd_170e74d75f5fa0702023-09-19Verified
Maine State AGbd_618fec45c9ed840c2023-09-19Verified
Massachusetts State AGbd_6c4427903eea7a9e2023-09-19Verified

Name: GRANT THORNTON LLP
norm: grant thornton

Name: GRANT THORNTON LLP
norm: grant thornton
Industry: Professional Servicesllm

Discovered: May 1, 2023
Breach occurred: Apr 19, 2023 – May 1, 2023
Undetected for: 12 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)PII
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1114 Email Collection
Threat actor: External

During the incident: Promptly began an internal investigation
Engaged a leading computer forensics firm to conduct a further investigation
Offering a complimentary one-year membership to Kroll’s Identity Monitoring Services
Changes made: Implementing additional technical controls
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 20 weeks(141 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 ↗

Indiana State AGSep 19 · first

Maine State AGSep 19 · first

Massachusetts State AGSep 19 · first

California State AGSep 19 · 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/sb24-573889
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 19, 2023
Raw hash: a36590359c41eb7cbdbff1b2a3df5ba068d69c1fc8af625358fbf9c8f3ba1057

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityGRANT THORNTON LLP

Victim entityGRANT THORNTON LLP

Incidentdiscovered May 1, 2023

Stated responsePromptly began an internal investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov