DisclosureLens
HackingTechnologyInformationData ExfiltratedCustomer Data InvolvedSupply Chain (3P Vendor)Identity (basic)MediumContained

Chess.com, LLC

bd_da3bc401913fa8ba · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 19, 2025

Filed

Sep 3, 2025

To disclose

11 weeks

Affected · nationwide

4,5411 in this filing

Linked

6 filings

Confidence

66%
Full breach record for Chess.com, LLC →

Chess.com, LLC reported a data breach affecting 4,541 individuals, including 1 Maine resident. Unauthorized access occurred between June 5 and June 18, 2025, via a third-party file transfer application. The breach was discovered on June 19, 2025. Personal information (names and other identifiers) was acquired. No financial data was compromised. Notifications were sent on September 3, 2025, offering 12 months of credit monitoring.

Maine clockDiscovered Jun 19, 2025 → Filed with AG Sep 3, 202576d ⏱ ME AG >30d11 weeks discovery → filing
⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 14 days
discovery → filing · 11 weeks / 76 days

Jun 5, 2025

Begins

Jun 19, 2025

Discovered

Sep 3, 2025

Filed

vs. sector median

8 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

Show 1 more filing ↓up to 5d gap

Filing propagation · 6 filings · 6 states

View merged incident ↗
Massachusetts State AGSep 3 · first
Indiana State AGSep 3 · first
Nebraska State AGSep 3 · first
Vermont State AGSep 3 · first
Maine State AGSep 3 · first · this page
New Hampshire State AG+5d

Pattern: first filing Sep 3 (MA), last Sep 8 (NH) — a 5-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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.