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ADP is calling it “a small number” of affected clients, but some employees of the payroll provider’s client firms have had tax and salary data stolen after cybercriminals gained entry through fraudulent registrations on ADP clients’ self-service registration portal.

According to the Society for Human Resource Management’s SHRM Online, the thieves were able to access the stolen data via company access codes to ADP’s portal when those companies made the codes available through an unsecured public website. The information taken included tax and salary data. In one case involving ADP client U.S. Bancorp, W-2 information was also stolen.

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