HackingHealthcareFinancial ServicesHealthcareVulnerability ExploitCapture Stored DataZero-DaySupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedPIIIdentity (basic)Government IDHealth (basic)Financial accountMediumContained

DELTA DENTAL OF CALIFORNIA

bd_b7d1eba67d9b0325 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 1, 2023

Filed

Dec 14, 2023

To disclose

28 weeks

Affected

Not disclosed

Linked

14 filings

Confidence

64%

Full breach record for DELTA DENTAL OF CALIFORNIA →5 incidents on file

Delta Dental of California and affiliates experienced a data security incident involving the MOVEit Transfer software. Unauthorized actors exploited a previously unknown vulnerability in the software between May 27 and May 30, 2023. The company discovered the incident on June 1, 2023. Personal information, including names, addresses, and potentially health/financial data, was accessed and acquired without authorization. The company engaged forensic experts, notified law enforcement, and is offering 24 months of identity monitoring to affected individuals.

J jump to incidentP pin to compareR raw source

California clockDiscovered Jun 1, 2023 → Notified Nov 27, 2023179d ✗ CA 60-day late28 weeks discovery → filing

Incident timeline

undetected · 5 days

discovery → filing · 28 weeks / 196 days

May 27, 2023

Begins

Jun 1, 2023

Discovered

Dec 14, 2023

Filed

vs. sector median

+19 wks slower

This filing is one of 14 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Massachusetts State AGbd_2aecb331d440f93c2023-12-14Verified
Oregon State AGbd_2c29103cacdbca1f2023-12-14Candidate
Vermont State AGbd_40e8f6904a6f52b92023-12-14Verified
Maine State AGbd_b0392e182589e9502023-12-29 · +15dVerified by operator

Show 6 more filings ↓up to 95d gap

Washington State AGbd_2b669447999006a92024-01-30 · +47dVerified
Montana State AGbd_999bf44f190153fb2024-02-07 · +55dVerified
Washington State AGbd_f32bc4138c99af892024-02-07 · +55dVerified
California State AGbd_ed716715756a40722024-03-14 · +91dVerified
New Hampshire State AGbd_b33482b171701d942024-03-15 · +92dVerified
Hawaii State AGbd_48ccff9e491e5a462024-03-18 · +95dVerified

Showing first 10 of 13 linked disclosures.

Name: DELTA DENTAL OF CALIFORNIA
norm: delta dental of california
Domain: deltadentalca.com

Name: DELTA DENTAL OF CALIFORNIA
norm: delta dental of california
Domain: deltadentalca.com
Industry: HealthcarellmFinancial Servicesllm

Discovered: Jun 1, 2023
Breach occurred: May 27, 2023 – May 30, 2023
Undetected for: 5 daysoccurrence → discovery
Materiality determined: —
Notification sent: Nov 27, 2023
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)Government IDHealth (basic)Financial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Notified law enforcement
Initial access: exploit_public_facing

During the incident: Launched a thorough investigation
Stopped access to the MOVEit software
Removed the malicious files
Conducted a thorough analysis of the MOVEit database
Applied the recommended patches
Reset administrative passwords to the MOVEit system
Enhanced unauthorized access monitoring related to MOVEit Transfer file access, malicious activity, and ransomware activity
Engaged independent third-party experts in computer forensics, analytics, and data mining
Notified law enforcement of the incident and have been cooperating with them
Changes made: Offering 24 months of free identity monitoring services through Kroll
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 28 weeks(196 days from discovery to filing)
Compliance flags: CA 60-day late · 179d
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: Jun 1, 2023
→ Notified: Nov 27, 2023
179d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Jun 1, 2023 → Notified: Nov 27, 2023	179d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 9 states

View merged incident ↗

Massachusetts State AGDec 14 · first

Oregon State AGDec 14 · first

Vermont State AGDec 14 · first

California State AGDec 14 · first · this page

Maine State AG+15d

Washington State AG+47d

Montana State AG+55d

Washington State AG+55d

California State AG+91d

New Hampshire State AG+92d

Hawaii State AG+95d

Pattern: first filing Dec 14 (MA), last Mar 18 (HI) — a 95-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 13 — the full spread may be wider.

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/sb24-577908
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 14, 2023
Raw hash: 5ae668bdfe30bde69d7e3279d5c932b7df9da13c08be036daa153948d41569e1

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityDELTA DENTAL OF CALIFORNIA

Victim entityDELTA DENTAL OF CALIFORNIA

Incidentdiscovered Jun 1, 2023

Stated responseLaunched a thorough investigation

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov