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.

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.

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.