PowerSchool, a popular online portal used by many New York school districts to manage student registration, grading, attendance and more, was hit by a data breach in December that saw the unauthorized release of some student information.

The data breach was announced last week by PowerSchool, a student information system used by more than 70% of school districts across the country and serving more than 60 million students and teachers.

PowerSchool, a software provider popular at K-12 schools, was the target of a data breach in late December that affected many districts in the U.S. and in other countries, according to the company and several impacted schools.