On December 21, 2020, NetGalley experienced a data security incident where a hacker accessed a backup file of the NetGalley database stored in Amazon Cloud. The breach occurred because a testing server was left unsecured, making credentials easily attainable. Exposed information included login names, passwords, first/last names, email addresses, countries, and optionally bios, mailing addresses, phone numbers, birthdays, company names, and Kindle email addresses. No financial information was involved. NetGalley re-secured testing sites, revised backup procedures, changed legacy passwords, added security features, and required password resets. The FBI was notified.