VulnerabilityBleeping Computer
8.5 — CRITICAL
Instructure confirms hackers used Canvas flaw to deface portals
Education technology giant Instructure has confirmed that a security vulnerability allowed hackers to modify Canvas login portals and leave an extortion message. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
A security vulnerability in Instructure's Canvas learning management system allowed hackers to deface login portals and steal sensitive data, with the threat actor using cross-site scripting (XSS) vulnerabilities to obtain authenticated admin sessions.
⚙️Technical Details
Affected Systems
CanvasFree-for-Teacher environment
Attack Vectors
Cross-site scripting (XSS) vulnerabilitiesUser-generated content features
💥Impact Assessment
Severity: high
Who Is at Risk
8,809 educational organizationsStudents, teachers, and staff membersSeverity: high
🛡️Recommended Actions
1Implement a web application firewall (WAF) to block suspicious traffic
2Regularly update Canvas to patch the exploited security issue
3Monitor user-generated content features for potential XSS vulnerabilities
📦Affected Products
CanvasFree-for-Teacher environment
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