CornerStone Staffing Solutions, Inc.
bd_9b87af94259300b8 · schema v1 · pii pii-v2
Full breach record for CornerStone Staffing Solutions, Inc. →Cornerstone Staffing Solutions, Inc. reported a data breach to the Oregon Attorney General. The breach was reported on 2026-09-11. The breach occurred during 11/6/2025 - 11/21/2025. The breach was discovered on 4/15/2026. 366,122 individuals were affected. Notice was sent on 9/11/2026.
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Incident timeline
Nov 6, 2025
Begins
Apr 15, 2026
Discovered
Sep 11, 2026
Filed
Linked disclosures
Why this link?Ransomware claims (1)
- Leak Siteqilinbd_ec840b7d9ffbec102025-11-13 · +302dVerified by operator
Regulatory filings (8) · sorted by filing gap
- Iowa State AGbd_7eea8c1a8a079a322026-09-11Verified
- Washington State AGbd_a19802f40428b48c2026-09-11Verified
- Indiana State AGbd_d23a943331b636382026-09-11Verified
- California State AGbd_e4dfd8c0234818a12026-09-11Verified
Show 4 more filings ↓Show fewer ↑up to 10d gap
- Vermont State AGbd_29de5dbb97b766ee2026-09-12 · +1dVerified
- Texas State AGbd_d3cf7d86357026862026-09-15 · +4dVerified by operator
- New Hampshire State AGbd_8bd7efdaf1859fe92026-09-18 · +7dVerified
- Massachusetts State AGbd_22dd62acb7c5bd852026-09-01 · +10dVerified
Filing propagation · 9 filings · 9 states
View merged incident ↗Pattern: first filing Sep 1 (MA), last Sep 18 (NH) — a 17-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?
Evidence ladder
Attacker assertion only. Establishes: claim date, group, alleged victim.
Unlocks: incident narrative, operational impact. Still no compliance clock.
Unlocks: discovery date, data types, affected count, compliance clock.
Unlocks: materiality, stated response, full audit trail. Ceiling removed.