HackingProfessional ServicesProfessional ServicesCustomer Data InvolvedTargetedPIIIdentity (basic)LowContained

THOMPSON COBURN LLP

bd_b40d210e2b06d256 · schema v1 · pii pii-v1

Severity

Low

Discovered

May 29, 2024

Filed

May 1, 2025

To disclose

48 weeks

Affected

Not disclosed

Confidence

65%

Full breach record for THOMPSON COBURN LLP →3 incidents on file

Thompson Coburn, LLP notified individuals of a cybersecurity incident where unauthorized actors accessed files containing names and other personal information between May 28-29, 2024. The firm engaged forensic specialists, reviewed affected files, and offered credit monitoring services. The incident is contained.

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Incident timeline

undetected · 1 days

discovery → filing · 48 weeks / 337 days

May 28, 2024

Begins

May 29, 2024

Discovered

May 1, 2025

Filed

vs. sector median

+34 wks slower

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

Name: THOMPSON COBURN LLP
norm: thompson coburn
Domain: thompsoncoburn.com

Name: THOMPSON COBURN LLP
norm: thompson coburn
Domain: thompsoncoburn.com
Industry: Professional Servicesllm

Discovered: May 29, 2024
Breach occurred: May 28, 2024 – May 29, 2024
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External

During the incident: Launched an investigation into the nature and scope of the activity with the assistance of third-party forensic specialists
Undertook a comprehensive review of the affected files
Offering you immediate access to credit monitoring and identity theft protection services for <<CM Duration>> months at no cost to you, through Equifax
Changes made: Reviewing existing security policies
Implemented additional cybersecurity measures to further protect against similar events moving forward
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 48 weeks(337 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://consumer.sc.gov/sites/consumer/files/Documents/Security%20Breach%20Notices/2025/ThompsonCoburnLLP.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 1, 2025
Raw hash: c248c17d0c4fed7531546fb3cf41909227ce4ee15388312a0c29b14739ed490f

Reporting entityTHOMPSON COBURN LLP

Victim entityTHOMPSON COBURN LLP

Incidentdiscovered May 29, 2024

Stated responseLaunched an investigation into the nature and scope of the activity with the assistance of third-party forensic specialists

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceconsumer.sc.gov