HackingHealthcareHealthcareSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDHealth (basic)PHIHighContained

Everside Health

bd_550f8fa8c2068d84 · schema v1 · pii pii-v1

Severity

High

Discovered

Jun 26, 2026

Filed

Jul 31, 2026

To disclose

5 weeks

Affected

21,308state residents only

Linked

3 filings

Confidence

71%

Full breach record for Everside Health →3 incidents on file

Everside Health, a healthcare provider, was notified by its business associate Aesto, LLC on June 26, 2026, of a security incident involving Aesto's AWS infrastructure. Between Dec 2-18, 2025, an unauthorized actor accessed PHI of ~21,308 Washington residents, including names, SSNs, DOBs, and medical record numbers. Aesto contained the incident, engaged forensic investigators, and began mailing notification letters on July 31, 2026, offering 12 months of credit monitoring.

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Washington clock⏱ WA AG >30d5 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 · 206 days

discovery → filing · 5 weeks / 35 days

Dec 2, 2025

Begins

Jun 26, 2026

Discovered

Jul 31, 2026

Filed

vs. sector median

6 wks faster

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Texas State AGbd_c97866167f4c4f182026-08-04 · +4dCandidate
Illinois State AGbd_5fa45c6d3968fd882026-07-01 · +30dVerified

Name: Everside Health
norm: everside health

Name: Everside Health
norm: everside health
Industry: Healthcarellm

Discovered: Jun 26, 2026
Breach occurred: Dec 2, 2025 – Dec 18, 2025
Undetected for: 206 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 31, 2026
Affected individuals: 21,308state-resident count only
Data types: Identity (basic)Government IDHealth (basic)PHI
Data elements: NameSocial Security numberDate of birthMedical information
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 200-299dexposure 1-99d
WA-stated discovery: Found after the fact
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Third party: via Aesto, LLCbusiness associate
Initial access: exploit_public_facing

During the incident: Commenced an investigation with support from cybersecurity professionals
Took steps to contain the incident
Notified the healthcare provider (Everside) on June 26, 2026
Established a dedicated, toll-free call center
Sent notification letters to affected individuals via USPS First-Class mail
Changes made: Continue to evaluate and modify its 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: 5 weeks(35 days from discovery to filing)
Compliance flags: WA AG >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 · 3 filings · 3 states

View merged incident ↗

Illinois State AGJul 1 · first

Washington State AG+30d · this page

Texas State AG+34d

Pattern: first filing Jul 1 (IL), last Aug 4 (TX) — a 34-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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA42089.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 31, 2026
Raw hash: 326fca5d0d81b41e717538250684e47a3175be042df3c42358f74fda48df4109

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityEverside Health

Victim entityEverside Health

Incidentdiscovered Jun 26, 2026

Stated responseCommenced an investigation with support from cybersecurity professionals

ComplianceWA AG >30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com