DisclosureLens
UnknownPCIFinancial accountMedium

Costco

bd_97a5559f454bed29 · schema v1 · pii pii-v2

Severity

Medium

Discovered

—

Filed

Sep 25, 2015

To disclose

—

Affected

2,592state residents only

Linked

3 filings

Confidence

95%
Full breach record for Costco →2 incidents on file

Costco reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2015-09-25. 2,592 Massachusetts residents were affected. The report records the breach type as electronic.

Incident timeline — partial

? — ?

Breach window unknown

Sep 25, 2015

Filed

—

Corroborated · see linked filings

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Filing propagation · 3 filings · 3 states

View merged incident ↗
New Hampshire State AGSep 22 · first
Washington State AGSep 22 · first
Massachusetts State AG+3d · 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.