Cornerstone Staffing Solutions, Inc. experienced a ransomware/data breach in November 2025. The company disclosed this incident in 2026 and began notifying affected individuals and the California Attorney General's office. The breach involved job seekers and clients of the staffing company.
Data types reportedly exposed include names, Social Security numbers, resumes, and other internal records. Social Security numbers were confirmed to be involved. There is no verified indication of medical data exposure. While internal financial documents were reportedly stolen, consumer financial account data exposure has not been confirmed. The exact number of affected individuals and a verified list of affected states have not been publicly disclosed.
A class-action lawsuit was filed in the U.S. District Court for the Northern District of California in March 2026, alleging that names and Social Security numbers were stolen. As this information is largely from secondary reporting, additional details regarding the breach, including exact affected counts and official notices, may emerge later.