CVE-2026-111369 classroomio CVE debrief

Who should care

Educational institutions using ClassroomIO, administrators, and security teams responsible for educational platforms should assess exposure and verify remediation to prevent unauthorized changes to educational content. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance, and plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Why it matters

CVE-2026-111369 is a high-severity vulnerability allowing authenticated students to modify or delete lessons in ClassroomIO through 1.0.0. Educational institutions and administrators should verify exposure and implement proper authorization checks to prevent unauthorized changes to educational content.

• Authenticated students can modify or delete lessons across courses
• Potential for unauthorized changes to educational content
• Risk of data integrity loss in educational settings
• Verification of authorization controls is necessary

Technical summary

The vulnerability exists in the PUT and DELETE /:lessonId lesson routes of ClassroomIO through 1.0.0. Authenticated students can modify lesson titles and HTML content or delete lessons in their course and other courses and organizations. This incorrect authorization allows any course member, including students, to modify lessons without proper checks, potentially leading to unauthorized changes to educational content and data integrity loss in educational settings. Defenders should prioritize verifying and remediating this vulnerability, especially in educational environments using ClassroomIO.

Defensive priority

Defenders should prioritize verifying and remediating this vulnerability, especially in educational environments using ClassroomIO.

Recommended defensive actions

• Verify ClassroomIO version and restrict access to lesson update and delete routes
• Implement proper authorization checks for course members
• Monitor for suspicious activity on lesson modifications and deletions
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The vulnerability is confirmed in ClassroomIO version 1.0.0 and earlier. The CVE Program and NVD provide official records, while VulnCheck and other sources offer additional details. Defenders should verify the existence of affected product deployments in managed environments and review official advisories or CVE records to validate affected scope, severity, and vendor guidance.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.