HELENA — The office of Montana State Auditor James Brown, the state's commissioner of securities and insurance, has launched an investigation into Blue Cross Blue Shield of Montana (BCBSMT) following a major data breach. According to the Auditor’s Office, the breach puts the personal and medical information of up to 462,000 Montana customers at risk.

"The amount of people that may have been impacted by this data breach, by this third-party provider — it's just staggering, it's unbelievable," Brown told MTN Wednesday.

BCBSMT is the largest health insurer in Montana. The company said in a statement to MTN that the breach was connected to Conduent, one of its vendors.

(WATCH: Blue Cross Blue Shield of Montana investigated over data breach) Blue Cross Blue Shield of Montana investigated

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