HackingHealthcareHealthcareVulnerability ExploitSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedIdentity (basic)PHILowContained

SUTTER HEALTH

bd_8f504197ab096f70 · schema v1 · pii pii-v1

Severity

Low

Discovered

Jul 26, 2023

Filed

Nov 3, 2023

To disclose

14 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

65%

Full breach record for SUTTER HEALTH →3 incidents on file

Sutter Health notified patients of a data breach involving its third-party vendor, Welltok, Inc. An unknown actor exploited software vulnerabilities in Welltok's MOVEit Transfer server on May 30-31, 2023, exfiltrating data including names and other personal information. Welltok was alerted on July 26, 2023, and confirmed the compromise on August 11, 2023. Affected individuals are offered credit monitoring and identity restoration services.

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California clockDiscovered Jul 26, 2023 → Notified Oct 31, 202397d ✗ CA 60-day late14 weeks discovery → filing

Incident timeline

undetected · 57 days

discovery → filing · 14 weeks / 100 days

May 30, 2023

Begins

Jul 26, 2023

Discovered

Nov 3, 2023

Filed

vs. sector median

+5 wks slower

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

Part of Welltok supply-chain incident (2023) — a supply-chain cascade affecting multiple organizations.View cascade →

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

HHS OCRbd_af3fc728ff443e642023-11-03Verified

Name: SUTTER HEALTH
norm: sutter health
Domain: sutterhealth.org

Name: SUTTER HEALTH
norm: sutter health
Domain: sutterhealth.org
Industry: Healthcarellm

Discovered: Jul 26, 2023
Breach occurred: May 30, 2023 – May 31, 2023
Undetected for: 57 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 31, 2023
Affected individuals: Not disclosed
Data types: Identity (basic)PHI
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: External
Third party: via Welltok, Inc.
Initial access: exploit_public_facing

During the incident: Launched an additional investigation with the assistance of third-party cybersecurity specialists
Conducted a full reconstruction of systems and historical data
Reviewed and enhanced existing policies and procedures related to data privacy
Notified potentially affected individuals
Offered complimentary access to Experian IdentityWorks for credit monitoring and identity restoration
Changes made: Reviewing and enhancing existing policies and procedures related to data privacy to reduce the likelihood of a similar future event
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(100 days from discovery to filing)
Compliance flags: CA 60-day late · 97d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Jul 26, 2023
→ Notified: Oct 31, 2023
97d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Jul 26, 2023 → Notified: Oct 31, 2023	97d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings

View merged incident ↗

HHS OCRNov 3 · first

California State AGNov 3 · 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://oag.ca.gov/ecrime/databreach/reports/sb24-576106
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 3, 2023
Raw hash: 00f55c3bc12ec0c2bbebce02d36065cb8bf4051625513b6d463bb6a60233d208

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entitySUTTER HEALTH

Victim entitySUTTER HEALTH

Incidentdiscovered Jul 26, 2023

Stated responseLaunched an additional investigation with the assistance of third-party cybersecurity specialists

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov