HackingHealthcareHealthcareStolen CredentialsCustomer Data InvolvedData ExfiltratedPHIHealth (basic)Identity (basic)Government IDFinancial accountHighContained

One Medical

bd_eb3976117e818979 · schema v1 · pii pii-v1

Severity

High

Discovered

Jun 13, 2026

Filed

Jul 3, 2026

To disclose

20 days

Affected

16,884state residents only

Linked

3 filings

Confidence

70%

Full breach record for One Medical →2 incidents on file

One Medical experienced a cyberattack on a third-party file-storage system used for archived patient data from One Medical Seniors (formerly Iora Health). Unauthorized access occurred between June 8-11, 2026. The incident affected 16,884 Washington residents, exposing PHI, SSNs, and billing info. One Medical revoked access, rotated credentials, and offered 2 years of credit monitoring.

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Washington clock✓ WA AG ≤30d20 days 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 · 5 days

discovery → filing · 20 days

Jun 8, 2026

Begins

Jun 13, 2026

Discovered

Jul 3, 2026

Filed

vs. sector median

6 wks faster

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

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

New Hampshire State AGbd_0a3e917e20144dd42026-07-06 · +3dVerified
HHS OCRbd_ace0db4fc909c3e32026-07-17 · +14dVerified

Name: 1Life Healthcare, Inc.
norm: 1life healthcare
Domain: app.onemedical.com

Name: One Medical
norm: one medical
Domain: app.onemedical.com
Industry: Healthcarellm

Discovered: Jun 13, 2026
Breach occurred: Jun 8, 2026 – Jun 11, 2026
Undetected for: 5 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 29, 2026
Affected individuals: 16,884state-resident count only
Data types: PHIHealth (basic)Identity (basic)Government IDFinancial account
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: Third-Party / Supply Chain
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External
Initial access: valid_credentials

During the incident: Revoked all user access
Rotating credentials for all employees with access to the system
Launched an investigation
Implemented additional safeguards
Changes made: Implemented additional safeguards to help prevent something like this from happening in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 20 days(20 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 ↗

Washington State AGJul 3 · first · this page

New Hampshire State AG+3d

HHS OCR+14d

Pattern: first filing Jul 3 (WA), last Jul 17 (CA) — a 14-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/BreachA41592.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 3, 2026
Raw hash: 19a7a33812fb49c0a532a5d8d16193d14ea613cb615f690b834b4d1a506833e4

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entity1Life Healthcare, Inc.

Victim entityOne Medical

Incidentdiscovered Jun 13, 2026

Stated responseRevoked all user access

ComplianceWA AG ≤30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com