MalwareHealthcareHealthcareRansomwareData ExfiltratedData EncryptedCustomer Data InvolvedIdentity (basic)Government IDPHIHealth (basic)Financial accountHighContained

Bayside Dental

bd_6a8490a03f05ff60 · schema v1 · pii pii-v1

Severity

High

Discovered

Jan 5, 2026

Filed

Apr 17, 2026

To disclose

15 weeks

Affected

9,683state residents only

Linked

5 filings

Confidence

70%

Full breach record for Bayside Dental →2 incidents on file

Bayside Dental reported a ransomware cyberattack on January 5, 2026, affecting 9,683 Washington residents. The incident involved unauthorized access and potential removal of files containing PHI, SSNs, DOBs, and health insurance info. The company secured its network, engaged external cybersecurity professionals, and is offering 12 months of credit monitoring and fraud assistance.

J jump to incidentP pin to compareR raw source

Washington clock✗ WA AG >90d15 weeks discovery → filing

⚠ occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Incident timeline

discovery → filing · 15 weeks / 102 days

Jan 5, 2026

Begins

Jan 5, 2026

Discovered

Apr 17, 2026

Filed

vs. sector median

+3 wks slower

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

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitesinobibd_585476fef6ea1bf72026-01-21 · +85dVerified

Regulatory filings (3) · sorted by filing gap

HHS OCRbd_7fa1baec43bd9dcb2026-04-17Verified
Massachusetts State AGbd_9baf37cb38f7338f2026-04-17Verified
New Hampshire State AGbd_1f7eca0bd1a934922026-04-20 · +3dVerified

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

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 17, 2026
Affected individuals: 9,683state-resident count only
Data types: Identity (basic)Government IDPHIHealth (basic)Financial account
Data elements: NameSocial Security numberHealth insurance IDMedical informationDate of birth
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 0dexposure 0d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Filed notice with Washington Attorney General

During the incident: Secured our network
Commenced a prompt and thorough investigation
Working very closely with external cybersecurity professionals
Providing complimentary credit monitoring services
Providing proactive fraud assistance
Changes made: Continually evaluate and modify practices and internal controls to enhance the security and privacy of personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 15 weeks(102 days from discovery to filing)
Compliance flags: WA AG >90dLeak >30d
Discovery-date grounding: occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 3 states

View merged incident ↗

HHS OCRApr 17 · first

Massachusetts State AGApr 17 · first

Washington State AGApr 17 · first · this page

New Hampshire State AG+3d

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/BreachA37808.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 17, 2026
Raw hash: 360a9953fc28731fa5369c10d19e2fe963f06d9244800143569daac0c10e5396

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

ComplianceWA AG >90d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com