Cornerstone Staffing Solutions
Disclosed Sep 11, 20262 weeks ago366,122 affectedConfirmed
What is known
| People affected | 366,122 (as reported by the organization) |
|---|---|
| Disclosed | Sep 11, 2026 |
| Discovered | Nov 17, 2025 |
| Happened | Nov 6, 2025 |
| Attack | Hacking |
| Data exposed | Social Security numbers, Government IDs, Health, Insurance, Payment cards, Financial, Dates of birth, Addresses, Names |
| Sector | Legal and services · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Cornerstone Staffing Solutionsoag.ca.gov · Official notice | Official notice |
| Washington Attorney General breach notice: Cornerstone Staffing Solutionsatg.wa.gov · Official notice | Official notice |
| Texas Attorney General data security breach report BR-0005330: Cornerstone Staffing Solutionsoag.my.site.com · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| California AGresidents of CA | Sep 11 | |
| Washington AGresidents of WA | Sep 11 | 681 |
| Texas AGresidents of TX | Sep 15 | 4,425 |
History of this record
- 2026-09-25 · data_types: [] to ["ssn","government-id","health","insurance","payment-card","financial","dob","addresses","names"] · backfill source
- 2026-09-25 · records_basis: empty to organization · backfill source
- 2026-09-25 · records: empty to 366122 · backfill source
- 2026-09-25 · attack: unknown to hacking · backfill source
- 2026-09-25 · discovered: empty to 2025-11-17 · backfill source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.