HackingHealthcareFinancial ServicesHealthcareVulnerability ExploitCapture Stored DataZero-DaySupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedPIIPHIIdentity (basic)Health (basic)LowContained

Delta Dental of California and affiliates

bd_3928b2315b9e5450 · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 1, 2023

Filed

Feb 7, 2024

To disclose

36 weeks

Affected

Not disclosed

Linked

6 filings

Confidence

65%

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, accessing and acquiring information between May 27 and May 30, 2023. The company discovered the incident on June 1, 2023. Affected data includes personal and health information. The company engaged forensic experts, notified law enforcement, and is offering 24 months of identity monitoring.

J jump to incidentP pin to compareR raw source

California clockDiscovered Jun 1, 2023 → Notified Nov 27, 2023179d ✗ CA 60-day late36 weeks discovery → filing

Incident timeline

undetected · 5 days

discovery → filing · 36 weeks / 251 days

May 27, 2023

Begins

Jun 1, 2023

Discovered

Feb 7, 2024

Filed

vs. sector median

+23 wks slower

This filing is one of 6 about the same incident.View merged incident

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

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

Vermont State AGbd_f9dd9d8c0025c2d42024-02-09 · +2dVerified
California State AGbd_84d913a18ea5d62d2024-01-31 · +7dCandidate
New Hampshire State AGbd_9e88312a77fdbd762024-01-24 · +14dVerified
California State AGbd_ed716715756a40722024-03-14 · +36dVerified

Show 1 more filing ↓up to 55d gap

California State AGbd_b7d1eba67d9b03252023-12-14 · +55dCandidate

Name: Delta Dental of California and affiliates
norm: delta dental of california
Domain: www1.deltadentalins.com

Name: Delta Dental of California and affiliates
norm: delta dental of california
Domain: www1.deltadentalins.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)Health (basic)
Attack vector: Unknown
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: 36 weeks(251 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 · 6 filings · 3 states

View merged incident ↗

California State AGDec 14 · first

New Hampshire State AG+41d

California State AG+48d

California State AG+55d · this page

Vermont State AG+57d

California State AG+91d

Pattern: first filing Dec 14 (CA), last Mar 14 (CA) — a 91-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://oag.ca.gov/ecrime/databreach/reports/sb24-580628
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 7, 2024
Raw hash: 87915df6d6a48bb0b7e17888073a5cb34ca5a3bc4d467e4f3ba175dfb9a43d0f

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityDelta Dental of California and affiliates

Victim entityDelta Dental of California and affiliates

Incidentdiscovered Jun 1, 2023

Stated responseLaunched a thorough investigation

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov