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.

As for students, data that could have been accessed include birth dates, grade levels, phone numbers, ethnicity, student ID numbers, and emergency contacts.

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.