Canvas Breach Disrupts Schools & Colleges Nationwide

Multiple high-impact incidents reported: a large-scale data extortion/defacement attack on the Canvas education platform claiming data from ~275 million students/faculty across ~9,000 institutions and disrupting coursework; Microsoft April Patch Tuesday addressing 167 vulnerabilities (including a SharePoint Server zero-day and a publicly disclosed Windows Defender flaw dubbed “BlueHammer”), plus Chrome and Adobe Reader zero-day fixes; Russian state-linked actors exploiting legacy router flaws to harvest Microsoft Office authentication tokens from ~18,000 networks; a Brazilian anti‑DDoS vendor被