HackingHealthcareFinancial ServicesHealthcareVulnerability ExploitData ExfiltratedTargetedIdentity (basic)Government IDMediumContained

California Physicians' Service dba Blue Shield of California - Medical Eye Services

bd_2b808583c3d2e06b · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 23, 2023

Filed

Nov 17, 2023

To disclose

12 weeks

Affected

362state residents only

Linked

2 filings

Confidence

64%

Blue Shield of California notified Montana residents of a data breach involving a third-party vision benefits vendor. The vendor exploited an unknown vulnerability in MOVEit to exfiltrate data on May 28-31, 2023. Blue Shield discovered the incident on August 23, 2023. Affected data likely includes names and government IDs. Blue Shield offered credit monitoring via Kroll.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 87 days

discovery → filing · 12 weeks / 86 days

May 28, 2023

Begins

Aug 23, 2023

Discovered

Nov 17, 2023

Filed

vs. sector median

on median

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

Washington State AGbd_16731eb00b06f3722023-11-17Candidate

Name: California Physicians' Service dba Blue Shield of California - Medical Eye Services
norm: california physicians service blue shield of california medical eye services

Name: California Physicians' Service dba Blue Shield of California - Medical Eye Services
norm: california physicians service blue shield of california medical eye services
Also named: California Physicians' Servicedba oflegal entity
Blue Shield of California - Medical Eye Servicesdba oftrade name
Industry: HealthcarellmFinancial Servicesllm

Discovered: Aug 23, 2023
Breach occurred: May 28, 2023 – May 31, 2023
Undetected for: 87 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 1, 2023
Affected individuals: 362state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Reported the matter to the FBI
Initial access: exploit_public_facing

During the incident: Engaged a cybersecurity firm
Reported the matter to the FBI
Offering complimentary credit monitoring and identity restoration services through Kroll
Changes made: Rebuilt the MOVEit system in accordance with gold standard build requirements
Undertook technical measures to validate security controls
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 12 weeks(86 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 ↗

Washington State AGNov 17 · first

Montana State AGNov 17 · 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/OCP/Consumer-notification-letter-861.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 17, 2023
Raw hash: 6b2a84cae3d77127bdbed0b54eed10ff1397df289d068896548f304e2dd4df0a

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityCalifornia Physicians' Service dba Blue Shield of California - Medical Eye Services

Victim entityCalifornia Physicians' Service dba Blue Shield of California - Medical Eye Services

Incidentdiscovered Aug 23, 2023

Stated responseEngaged a cybersecurity firm

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov