20.6M accounts from ai.type (aitype.com) were exposed in this breach. Besides email addresses, it included address book contacts, apps installed on devices and cellular network names.
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Address book contactsApps installed on devicesCellular network namesDates of birthDevice informationEmail addressesGendersGeographic locationsIMEI numbersIMSI numbersIP addressesNamesPhone numbersProfile photosSocial media profiles
In December 2017, the virtual keyboard application ai.type was found to have left a huge amount of data publicly facing in an unsecured MongoDB instance. Discovered by researchers at The Kromtech Security Center, the 577GB data set included extensive personal information including over 20 million unique email addresses, social media profiles and address book contacts. The email addresses alone were provided to HIBP to enable impacted users to assess their exposure.
Source: Have I Been Pwned (CC BY 4.0)