The personal data of more than 20,000 students, staff and past graduates of the Chinese University of Hong Kong’s School of Continuing and Professional Studies could be at risk after an e-learning system was hacked earlier this month. In a statement on Thursday, the school said it found out on June 3 that its “moodle learning management system” had been hacked. “The data concerned involves name, email address and student registration number … of 20,870 [users of the system] who are staff, part-time instructors, students, graduates and some guest users,” it said.