An anonymous reader shares a report: U.S. school districts affected by the recent cyberattack on edtech giant PowerSchool have told TechCrunch that hackers accessed “all” of their historical student and teacher data stored in their student information systems. PowerSchool, whose school records software is used to support more than 50 million students across the United States, was hit by an intrusion in December that compromised the company’s customer support portal with stolen credentials, allowing access to reams of personal data belonging to students and teachers in K-12 schools.

The attack has not yet been publicly attributed to a specific hacker or group. PowerSchool hasn’t said how many of its school customers are affected. However, two sources at affected school districts — who asked not to be named — told TechCrunch that the hackers accessed troves of personal data belonging to both current and former students and teachers. Further reading: Lawsuit Accuses PowerSchool of Selling Student Data To 3rd Parties.