Insurance administrative services company Landmark Admin, which works with many of the country’s largest insurance carriers, has announced a data breach that occurred earlier this year, impacting more than 800,000 people.

Landmark says a cyberattack on its systems in May led to the leak.

The insurance administrator partners with major companies that collectively hold the private details of millions of individuals. Partners include Pellerin Life Insurance Company and American Monumental Life Insurance Company. As a result of the attack, more people could be at risk of having sensitive information leaked, including their Social Security number.

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A notification to the Office of the Maine Attorney General details the incident, stating the breach occurred on May 13 via an external hack. In total, 806,519 persons were affected.

Once the breach was discovered, Landmark hired a third-party cybersecurity team to help secure its network and identify the scope of the hack. While the investigation was ongoing, hackers again broke into Landmark’s system on June 17, less than one month after the initial break-in.

On top of Social Security numbers, the investigation concluded that attackers may have obtained addresses, full names, tax IDs, driver’s license numbers, state-issued ID numbers, passport numbers, banking details, medical information, health insurance policy numbers, dates of birth, and information about insurance policies.

Landmark is notifying impacted individuals via notices through first-class mail and offering free identity theft protection services.

Earlier this month, The Dallas Express reported that the Texas Department of Public Safety leaked the personal details of more than 115,000 state residents. The compromise included names, addresses, medical details, and other sensitive information.

In August, a breach at data broker National Public Data compromised the private details of millions of people. The hacker responsible for the attack initially demanded a $3.5 million ransom to return the data but later released it on a hacking forum for free.