The museum reports that the information included things like contact information, demographics, and prior donations.
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They say hackers did not access anything related to credit cards or bank accounts.
The breach occurred between February and May.
The museum says the system is run by a company called 'Blackbaud,' and that the company has no reason to believe the cybercriminal shared any data that it may have accessed.
Blackbaud also said they have hired a third-party security service to monitor for indications that any information was released.
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