HackingProfessional ServicesProfessional ServicesData ExfiltratedCustomer Data InvolvedEmployee Data InvolvedPIIIdentity (basic)Government IDMediumContained

CornerStone Staffing Solutions, Inc.

bd_7eea8c1a8a079a32 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Nov 17, 2025

Filed

Sep 11, 2026

To disclose

43 weeks

Affected

915state residents only

Linked

10 records

Confidence

68%

Full breach record for CornerStone Staffing Solutions, Inc. →

Cornerstone Staffing Solutions, Inc. notified the Iowa Attorney General of a data security incident detected on November 17, 2025. Unauthorized access to systems occurred between November 6 and 21, 2025, potentially exposing personal information of 915 Iowa residents, including names and government identifiers. The company engaged third-party forensic investigators, offered 12 months of credit monitoring, and mailed notifications on September 11, 2026.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d43 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 11 days

discovery → filing · 43 weeks / 298 days

Nov 6, 2025

Begins

Nov 17, 2025

Discovered

Sep 11, 2026

Filed

vs. sector median

+23 wks slower

This filing is one of 10 records about the same incident.View merged incident

A leak claim by qilin about this victim was first seen 302 days before this filing.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siteqilinbd_ec840b7d9ffbec102025-11-13 · +302dVerified by operator

Regulatory filings (8) · sorted by filing gap

Oregon State AGbd_9b87af94259300b82026-09-11Verified
Washington State AGbd_a19802f40428b48c2026-09-11Verified
Indiana State AGbd_d23a943331b636382026-09-11Verified
California State AGbd_e4dfd8c0234818a12026-09-11Verified

Show 4 more filings ↓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

Name: CornerStone Staffing Solutions, Inc.
norm: cornerstone staffing
Domain: cornerstone-staffing.com

Name: CornerStone Staffing Solutions, Inc.
norm: cornerstone staffing
Domain: cornerstone-staffing.com
Industry: Professional Servicesllm

Discovered: Nov 17, 2025
Breach occurred: Nov 6, 2025 – Nov 21, 2025
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 11, 2026
Affected individuals: 915state-resident count only
Data types: PIIIdentity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: External
Initial access: exploit_public_facing

During the incident: Launched an internal investigation
Engaged a third-party cybersecurity firm to contain the threat, support the investigation into the incident, and determine the scope of the unauthorized access
Worked diligently with an external data mining vendor to analyze the files on the systems which may have been impacted
Began notifying these individuals by U.S. Mail on September 11, 2026
Offering affected individuals twelve months of complimentary credit monitoring and other consumer protection services, including fraud loss reimbursement insurance coverage
Changes made: Implemented additional security measures
Continuing to evaluate ways to further enhance the security of its systems to minimize the likelihood of similar events occurring in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 43 weeks(298 days from discovery to filing)
Compliance flags: Leak >180dIA AG ≤5 bday
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 9 filings · 9 states

View merged incident ↗

Massachusetts State AGSep 1 · first

Oregon State AG+10d

Washington State AG+10d

Indiana State AG+10d

California State AG+10d

Iowa State AG+10d · this page

Vermont State AG+11d

Texas State AG+14d

New Hampshire State AG+17d

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

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://www.iowaattorneygeneral.gov/media/cms/9112026_Cornerstone_Staffing_Soluti_E5EA7DA7389B8.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 11, 2026
Raw hash: 586d4174bd17a137a2534ceb48d210e8f51a557870a68e4ff5fc11ac1c639278

Linked disclosures

Ransomware claims (1)

Regulatory filings (8) · sorted by filing gap

Reporting entityCornerStone Staffing Solutions, Inc.

Victim entityCornerStone Staffing Solutions, Inc.

Incidentdiscovered Nov 17, 2025

Stated responseLaunched an internal investigation

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancewww.iowaattorneygeneral.gov