HackingHealthcareFinancial ServicesHealthcareVulnerability ExploitCapture Stored DataZero-DaySupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedPIIPHIIdentity (basic)Government IDHealth (basic)MediumContained

DELTA DENTAL OF CALIFORNIA

bd_ed716715756a4072 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 1, 2023

Filed

Mar 14, 2024

To disclose

41 weeks

Affected

Not disclosed

Linked

14 filings

Confidence

65%

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 PHI and PII, 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 late41 weeks discovery → filing

Incident timeline

undetected · 5 days

discovery → filing · 41 weeks / 287 days

May 27, 2023

Begins

Jun 1, 2023

Discovered

Mar 14, 2024

Filed

vs. sector median

+32 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

New Hampshire State AGbd_b33482b171701d942024-03-15 · +1dVerified
Hawaii State AGbd_48ccff9e491e5a462024-03-18 · +4dVerified
Montana State AGbd_999bf44f190153fb2024-02-07 · +36dVerified
Washington State AGbd_f32bc4138c99af892024-02-07 · +36dVerified

Show 6 more filings ↓up to 91d gap

Washington State AGbd_2b669447999006a92024-01-30 · +44dVerified
Maine State AGbd_b0392e182589e9502023-12-29 · +76dVerified by operator
Massachusetts State AGbd_2aecb331d440f93c2023-12-14 · +91dVerified
Oregon State AGbd_2c29103cacdbca1f2023-12-14 · +91dCandidate
Vermont State AGbd_40e8f6904a6f52b92023-12-14 · +91dVerified
Montana State AGbd_54f04c0719e262cf2023-12-14 · +91dVerified

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: PIIPHIIdentity (basic)Government IDHealth (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: External
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: 41 weeks(287 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

Montana State AGDec 14 · first

Maine State AG+15d

Washington State AG+47d

Montana State AG+55d

Washington State AG+55d

California State AG+91d · this page

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/sb24-582446
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 14, 2024
Raw hash: 69f8a1762f9a7b43b6bf1d0eeac6c18550a01d6f393a910548461eed31450e0f

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