Social EngineeringHealthcareFinancial ServicesHealthcarePhishingStolen CredentialsData ExfiltratedData PublishedCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDHealth (basic)PHICriticalContained

DentaQuest, LLC

bd_36645eac8bc688a6 · schema v1 · pii pii-v1

Severity

Critical

Discovered

May 20, 2026

Filed

Jul 16, 2026

To disclose

8 weeks

Affected · nationwide

15,000,00091,700 in this filing

Linked

19 filings

Confidence

67%

Full breach record for DentaQuest, LLC →5 incidents on file

DentaQuest, LLC reported a phishing incident affecting at least 91,700 Washington residents and up to 15 million nationwide. Unauthorized access occurred May 17-19, 2026, via stolen credentials obtained through social engineering. Exfiltrated data included names, SSNs, DOBs, Medicare/Medicaid IDs, and PHI. DentaQuest engaged CrowdStrike and Kroll, notified the FBI and HHS OCR, and offered 24 months of identity monitoring. Data was posted on the dark web.

J jump to incidentP pin to compareR raw source

Washington clock⏱ WA AG >30d8 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 3 days

discovery → filing · 8 weeks / 57 days

May 17, 2026

Begins

May 20, 2026

Discovered

Jul 16, 2026

Filed

vs. sector median

4 wks faster

This filing is one of 19 about the same incident.View merged incident

A leak claim by shinyhunters about this victim predates this filing by 49 days.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Rhode Island State AGbd_1133bd1e67e874152026-07-16Verified
California State AGbd_3bc7925dd29517192026-07-16Verified
Texas State AGbd_4a5196edfadecf3b2026-07-17 · +1dVerified
Nebraska State AGbd_4d1ee0875da1a2ff2026-07-17 · +1dVerified

Show 6 more filings ↓up to 27d gap

Delaware State AGbd_f990f6918f923e332026-07-17 · +1dVerified
New Hampshire State AGbd_109ea4be4ea997032026-07-29 · +13dVerified
Massachusetts State AGbd_1e8db8bfc75827d62026-07-30 · +14dVerified
Idaho State AGbd_571c7231b18fedc32026-07-30 · +14dVerified
Idaho State AGbd_0510572adf88325a2026-08-03 · +18dVerified
Idaho State AGbd_b048476c6c1e18832026-08-12 · +27dVerified

Showing first 10 of 18 linked disclosures.

Name: NUTTER, MCCLENNEN & FISH, LLP
norm: nutter mcclennen fish

Name: DentaQuest, LLC
norm: dentaquest
Industry: HealthcarellmFinancial Servicesllm

Discovered: May 20, 2026
Breach occurred: May 17, 2026 – May 19, 2026
Undetected for: 3 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 17, 2026
Affected individuals: 15,000,000state + nationwide
Data types: Identity (basic)Government IDHealth (basic)PHI
Data elements: NameSocial Security numberDate of birthHealth insurance IDMedical informationProtected health information
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found after the fact
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Notified the United States Department of Health and Human Services, Office of Civil RightsInformed the FBI
Initial access: phishing_link

During the incident: Engaged outside legal counsel, Nutter, McClennen & Fish
Engaged CrowdStrike Services to conduct an independent investigation
Implemented containment measures on May 20, 2026
Informed the FBI about the incident on May 21, 2026
Engaged Kroll Associates, Inc. to review the data accessed
Notified the United States Department of Health and Human Services, Office of Civil Rights
Notified the three major credit reporting agencies
Changes made: Offered two years of credit monitoring services
Offered identity monitoring by Kroll at no cost for 24 months
Engaged cybersecurity experts
Provided more employee training
Added new security measures
Increased monitoring
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 8 weeks(57 days from discovery to filing)
Compliance flags: WA AG >30dLeak >30d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 9 states

View merged incident ↗

Rhode Island State AGJul 16 · first

California State AGJul 16 · first

Washington State AGJul 16 · first · this page

Texas State AG+1d

Nebraska State AG+1d

Delaware State AG+1d

New Hampshire State AG+13d

Massachusetts State AG+14d

Idaho State AG+14d

Idaho State AG+18d

Idaho State AG+27d

Pattern: first filing Jul 16 (RI), last Aug 12 (ID) — a 27-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 18 — 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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA41829.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 16, 2026
Raw hash: 04b0bdfa1afe4946b0e2d27fcece639a0262c48c1cccc8a75768dd7a732b4efe

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityNUTTER, MCCLENNEN & FISH, LLP

Victim entityDentaQuest, LLC

Incidentdiscovered May 20, 2026

Stated responseEngaged outside legal counsel, Nutter, McClennen & Fish

ComplianceWA AG >30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com