AccidentalHealthcareTechnologyHealthcareMisdeliveryDelayed DiscoveryData ExfiltratedCustomer Data InvolvedPIIPHIHealth (basic)Identity (basic)LowContained

GUARDANT HEALTH, INC.

bd_667d31d8ec325fca · schema v1 · pii pii-v1

Severity

Low

Discovered

Mar 4, 2024

Filed

May 3, 2024

To disclose

9 weeks

Affected

14state residents only

Linked

5 filings

Confidence

65%

Full breach record for GUARDANT HEALTH, INC. →4 incidents on file

Guardant Health, Inc. notified Montana residents that a file containing patient PII and PHI (names, ages, medical record numbers, treatment info) was inadvertently made publicly accessible. The file was transferred in Oct 2020 but copied by third parties between Sept 2023 and Feb 2024. No SSNs or financial data were involved. Guardant removed the file, investigated, and enhanced controls.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 1250 days

discovery → filing · 9 weeks / 60 days

Oct 1, 2020

Begins

Mar 4, 2024

Discovered

May 3, 2024

Filed

vs. sector median

4 wks faster

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Vermont State AGbd_0cc35de939dca4022024-05-03Verified
California State AGbd_bf30833a7e61dbb32024-05-03Verified
Illinois State AGbd_3c733c8d7ae6714d2024-05-01 · +2dVerified
HHS OCRbd_dc3c65f1e089173f2024-04-26 · +7dVerified

Name: GUARDANT HEALTH, INC.
norm: guardant health
Domain: guardanthealth.com

Name: GUARDANT HEALTH, INC.
norm: guardant health
Domain: guardanthealth.com
Industry: HealthcarellmTechnologyllm

Discovered: Mar 4, 2024
Breach occurred: Oct 1, 2020 – Oct 31, 2020
Undetected for: 1,250 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 4, 2024
Affected individuals: 14state-resident count only
Data types: PIIPHIHealth (basic)Identity (basic)
Attack vector: Misconfiguration
MITRE ATT&CK: T1119 Automated Collection
Threat actor: External

During the incident: Removed the file from the online platform
Initiated an investigation
Enhanced technical controls in systems that contain patient information
Continue to educate our workforce regarding the handling of sensitive information
Changes made: Enhanced technical controls in systems that contain patient information
Educate our workforce regarding the handling of sensitive information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(60 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 4 states

View merged incident ↗

HHS OCRApr 26 · first

Illinois State AG+5d

Vermont State AG+7d

California State AG+7d

Montana State AG+7d · this page

Pattern: first filing Apr 26 (CA), last May 3 (MT) — a 7-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.

Source URL: https://dojmt.gov/wp-content/uploads/OCP/Consumer-notification-letter-1335.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 3, 2024
Raw hash: d71d8302aa70f3b1cd4c29bc3250827dd435360b7306172d7ed8c249b77e5976

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityGUARDANT HEALTH, INC.

Victim entityGUARDANT HEALTH, INC.

Incidentdiscovered Mar 4, 2024

Stated responseRemoved the file from the online platform

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov