HackingHealthcareHealthcareCustomer Data InvolvedDelayed DiscoveryPHIGovernment IDIdentity (basic)Health (basic)MediumContained

Bayside Dental

bd_1f7eca0bd1a93492 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 5, 2026

Filed

Apr 20, 2026

To disclose

15 weeks

Affected

2state residents only

Linked

5 filings

Confidence

65%

Full breach record for Bayside Dental →2 incidents on file

Bayside Dental notified the NH Attorney General of an amended incident notification regarding unauthorized access to its network on January 5, 2026. The breach affected 2 New Hampshire residents. Personal information exposed included full name, date of birth, Social Security number, health insurance information, medical treatment and diagnostic information, patient number, and dates of service. The organization engaged external cybersecurity professionals, secured the network, and offered complimentary credit monitoring and fraud assistance to affected individuals.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >30d15 weeks discovery → filing

Incident timeline

discovery → filing · 15 weeks / 105 days

Jan 5, 2026

Begins

Jan 5, 2026

Discovered

Apr 20, 2026

Filed

vs. sector median

+3 wks slower

This filing is one of 5 about the same incident.View merged incident

A leak claim by sinobi about this victim predates this filing by 88 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitesinobibd_585476fef6ea1bf72026-01-21 · +88dVerified

Regulatory filings (3) · sorted by filing gap

Washington State AGbd_6a8490a03f05ff602026-04-17 · +3dCandidate
HHS OCRbd_7fa1baec43bd9dcb2026-04-17 · +3dVerified
Massachusetts State AGbd_9baf37cb38f7338f2026-04-17 · +3dVerified

Name: Bayside Dental
norm: bayside dental

Name: Bayside Dental
norm: bayside dental
Domain: baysidedental.com
Industry: Healthcarellm

Discovered: Jan 5, 2026
Breach occurred: Jan 5, 2026
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 13, 2026
Affected individuals: 2state-resident count only
Data types: PHIGovernment IDIdentity (basic)Health (basic)
Data elements: Social Security numberDate of birthMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified Office of the Attorney General, Consumer Protection Bureau, New Hampshire

During the incident: Secured our network
Commenced a prompt and thorough investigation
Worked very closely with external cybersecurity professionals experienced in handling these types of incidents
Conducted a thorough review of the potentially impacted data
Offering the affected residents whose Social Security numbers were impacted complimentary memberships with a credit monitoring service
Providing access to Single Bureau Credit Monitoring/Single Bureau Credit Report/Single Bureau Credit Score services at no charge
Providing proactive fraud assistance
Changes made: Continually evaluate and modify its practices to enhance the security and privacy of the personal information it maintains
Continually evaluate and modify its practices and internal controls to enhance the security and privacy of your personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 15 weeks(105 days from discovery to filing)
Compliance flags: Leak >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 3 states

View merged incident ↗

Washington State AGApr 17 · first

HHS OCRApr 17 · first

Massachusetts State AGApr 17 · first

New Hampshire State AG+3d · this page

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://mm.nh.gov/files/uploads/doj/remote-docs/bayside-dental-20260420.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 20, 2026
Raw hash: 80d284b23276bd418cc1b70b22e1a7dca972212f6fc2693fe0e3a2449274667f

Linked disclosures

Ransomware claims (1)

Regulatory filings (3) · sorted by filing gap

Reporting entityBayside Dental

Victim entityBayside Dental

Incidentdiscovered Jan 5, 2026

Stated responseSecured our network

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov