HackingRetail & ConsumerRetailStolen CredentialsSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)Financial accountFinancial credentialsLowContained

Costco

bd_4231180bf7d68e20 · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 1, 2017

Filed

Jul 10, 2017

To disclose

6 weeks

Affected

4state residents only

Linked

2 filings

Confidence

64%

Full breach record for Costco →2 incidents on file

Costco notified Montana employees that Sabre, a third-party travel booking provider, experienced a data breach between Aug 2016 and Mar 2017. Stolen credentials allowed access to encrypted hotel reservation data including names, addresses, payment card numbers, and potentially security codes. Costco discovered the breach in late June 2017 and offered identity theft protection services.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 295 days

discovery → filing · 6 weeks / 39 days

Aug 10, 2016

Begins

Jun 1, 2017

Discovered

Jul 10, 2017

Filed

vs. sector median

2 wks faster

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_fe9bd2362b2f4a012017-07-10Verified

Name: Costco
norm: costco
Domain: costco.com

Name: Costco
norm: costco
Domain: costco.com
Industry: Retail & Consumerllm

Discovered: Jun 1, 2017
Breach occurred: Aug 10, 2016 – Mar 9, 2017
Undetected for: 295 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 4state-resident count only
Data types: Identity (basic)Financial accountFinancial credentials
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Third party: via Sabre
Initial access: valid_credentials

During the incident: Sabre notified law enforcement and the payment card brands
Engaged a forensic investigator to investigate the incident
Costco offers identity theft protection services to all employees at no charge
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(39 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Massachusetts State AGJul 10 · first

Montana State AGJul 10 · 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://dojmt.gov/wp-content/uploads/Costco.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 10, 2017
Raw hash: a29d7cfd9675e69eff862ecc6973bea69971f0b299973384beb806205bbc7e8d

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityCostco

Victim entityCostco

Incidentdiscovered Jun 1, 2017

Stated responseSabre notified law enforcement and the payment card brands

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov