Cornerstone Staffing Solutions 2025 Data Breach
Employment / Staffing & Recruiting / Consumer / Enterprise
Cornerstone Staffing Solutions 2025 Data Breach: Job-Seeker Data Exposed via Qilin Ransomware
US staffing and workforce-solutions firm.
Confirmed · ObscureIQ Intelligence
Breach Risk Index i
93/100
Lower riskHigher risk
High and current: recent, valuable data circulating on the dark web now.
Data Sensitivity i
ElevatedExposed data raises the risk of fraud, targeting, and impersonation. Proactive steps are warranted.
575k rowsRecords
2025Year
The Breach Risk Index (BRI) is a proprietary 0–100 score rating how dangerous a breach is right now, based on how recently the data has been circulating on the dark web and how valuable it is to attackers.
Crucial data exposed
SSNSocial Security Number
AddressHome address
Breach Summary
On November 13, 2025 the Qilin ransomware group claimed a breach of Cornerstone Staffing Solutions, exfiltrating about 300 GB including the resumes of over 120,000 job seekers plus internal banking, invoice and budget files. Exposed personal data included names, contact details, occupation, phone numbers, home addresses and Social Security numbers.
Full threat analysis, exploitation vectors, and principal guidance below.
10 additional sections · verified field analysis · defensive doctrine
Querying breach corpus…
Cross-referencing exposed field types…
Resolving threat-actor attribution…
Compiling principal risk advisory…
575k rows records analyzed
About Cornerstone Staffing Solutions
Cornerstone Staffing Solutions is a US staffing firm placing workers across sectors and managing job-seeker and client-employer relationships.
Why They Hold Your Data
A staffing firm holds job-seeker identity and contact data, resumes, dates of birth and SSNs collected for placement and onboarding, plus client and financial records.
Recent Developments
The Qilin ransomware group claimed the attack in November 2025, leaking resumes and internal files.
Data Points Exposed
6 verified field types
Email Address
Full Name
Home address High
Job Information (occupation)
Phone Number
Social Security Number Critical
Breach Impact
As a staffing intermediary, exposure spans many job seekers across client employers; the leak of full resumes plus SSNs elevates identity-fraud and employment-scam risk.
Principal Risk Advisory
What this means for a principal
A consumer-service breach: contact and account data supports phishing, account takeover and profile enrichment. For a high-profile principal this is targeting-grade, not merely identity-theft-grade: the combination lets an adversary locate, impersonate, or pressure the principal with little additional work.
What You Should Do
- Freeze credit at all three bureaus and monitor for new-account and tax-refund fraud.
- Treat the home address as exposed: review mail and package handling and physical-security routines, and brief household staff to verify unusual requests.
- Guard against SIM-swap and vishing: add a carrier port-out PIN and verify any 'support' calls independently.
- Do not use unofficial 'am I affected' lookups; several are themselves harvesting operations.
How ObscureIQ Can Help
- Corpus confirmation: determine whether and where the principal (plus household and staff) appear in this dataset and which specific fields are exposed for them.
- Exposure mapping and footprint neutralization: cross-reference against broker-available data and suppress still-removable elements, prioritizing address and phone, since this record re-seeds broker networks.
- ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).
Q/
Threat Actor: Qilin / AgendaConfidence: High
Motivation: Financial extortion
A ransomware-as-a-service group also known as Agenda and first observed in 2022. It became one of the more active ransomware groups in 2025, with targeting across healthcare, manufacturing, legal services, critical infrastructure, and public-sector entities.
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