Insurance company Aflac disclosed this week that cybercriminals breached its U.S. network and may have accessed customers’ personal information, the latest in a string of cyberattacks on insurance companies announced this month.

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.

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.