Cybercriminals have breached insurance giant Aflac, potentially stealing Social Security numbers, insurance claims and health information, the company said Friday, the latest in a spree of hacks against the insurance industry.

Aflac, a U.S. insurance provider that covers millions of policyholders, warned some of its customers' most sensitive data may have been stolen in a recent cyberattack. Why it matters: Aflac warned that a "sophisticated cybercrime group" was behind the intrusion and said many insurance providers are currently battling the same group.