Social EngineeringHealthcareFinancial ServicesHealthcarePhishingStolen CredentialsData ExfiltratedData PublishedCustomer Data InvolvedEmployee Data InvolvedMulti-Stage ChainIdentity (basic)Government IDHealth (basic)PHICriticalContained

DentaQuest, LLC

bd_780432df72dbdd03 · schema v1 · pii pii-v1

Severity

Critical

Discovered

May 20, 2026

Filed

Jul 16, 2026

To disclose

8 weeks

Affected · nationwide

15,000,0003,200 in this filing

Linked

22 records

Confidence

64%

Full breach record for DentaQuest, LLC →6 incidents on file

DentaQuest LLC reported a data security incident where a social engineering attack tricked an employee into providing credentials and MFA codes. The threat actor accessed and exfiltrated data from a network file share between May 17-19, 2026. Data included names, SSNs, DOBs, Medicare/Medicaid IDs, and PHI. Over 15 million individuals nationwide were affected, including 3,200 Iowa residents. The actor posted data on the dark web. DentaQuest engaged CrowdStrike and Kroll, notified the FBI and HHS OCR, and offered 24 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >30d8 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

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

1 wks faster

This filing is one of 22 records about the same incident.View merged incident

A leak claim by shinyhunters about this victim was first seen 49 days before this filing.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Indiana State AGbd_36b0303cd630b8522026-07-17 · +1dVerified
Texas State AGbd_4a5196edfadecf3b2026-07-17 · +1dVerified
Nebraska State AGbd_4d1ee0875da1a2ff2026-07-17 · +1dVerified
New Hampshire State AGbd_109ea4be4ea997032026-07-29 · +13dVerified

Show 6 more filings ↓up to 98d gap

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
Massachusetts State AGbd_482378fdc49ac6952026-09-01 · +47dVerified
New Hampshire State AGbd_698b0f815be60a922026-10-22 · +98dVerified

Showing first 10 of 21 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
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 about the incident on May 21, 2026
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
Offered two years of credit monitoring services to the affected individuals
Provided substitute notice pursuant to 45 CFR § 164.404(d)(2)
Provided media notice pursuant to 45 CFR § 164.406
Notified the three major credit reporting agencies of the incident
Changes made: 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: Leak >30dIA AG ≤5 bday
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 7 states

View merged incident ↗

Iowa State AGJul 16 · first · this page

Indiana State AG+1d

Texas State AG+1d

Nebraska State AG+1d

New Hampshire State AG+13d

Massachusetts State AG+14d

Idaho State AG+14d

Idaho State AG+18d

Idaho State AG+27d

Massachusetts State AG+47d

New Hampshire State AG+98d

Pattern: first filing Jul 16 (IA), last Oct 22 (NH) — a 98-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 21 — 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://www.iowaattorneygeneral.gov/media/cms/7162026_DentaQuest_LLC_7AF13807994B7.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: aae234220642a63247cd5f739e77d9e5d551c9d8ea5c514653d02d001c20703a

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

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenancewww.iowaattorneygeneral.gov