Education technology company Instructure, maker of the widely-used Canvas learning platform, has disclosed a data breach following a cyberattack that disrupted services over the May Day weekend. The company says attackers accessed personal information including names, email addresses, and student ID numbers, while the hacker group ShinyHunters claims to have stolen 3.65 terabytes of data affecting 275 million students and teachers at nearly 9,000 institutions worldwide. Instructure has revoked privileged credentials, reissued application keys, and deployed security fixes, though they haven't confirmed the full scope of the breach or specifically attributed the attack to ShinyHunters.