Tech company Dropbox has been sued in four class actions for a data breach that allegedly compromised the personal information of “hundreds of thousands” of users, according to attorneys.

The suits, filed in May in the U.S. District Court for the Northern District of California, accuse the file sharing platform of exposing its clients to a “high risk of identity theft or fraud” by failing to prevent a cyberattack by an “undoubtedly nefarious” third party on April 24.