BALTIMORE (AP) — The Maryland Joint Insurance Association left data about some of its customers exposed online, but there's no evidence it was accessed improperly.

The Baltimore Sun reported Wednesday that a California-based cybersecurity firm known as UpGuard found the exposed data and notified the insurer.

The insurer's general manager, Christopher Dooley, said, "They made us aware of the potential threat and we reached out to our own IT specialists who have taken care of the threat"

The insurer confirmed it had moved archived data months before to a backup system maintained internally and didn't realize the information lacked proper safeguards. There are no Social Security numbers or bank information maintained.

The Maryland Joint Insurance Association was formed 50 years ago by the insurance industry to provide property coverage to the hard-to-insure.

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Information from: The Baltimore Sun, http://www.baltimoresun.com