CVE-2026-124551
Deferred Deferred - Pending Action

Authorization Bypass in ClassroomIO Allows Course Cloning

Publication date: 2026-11-08

Last updated on: 2026-11-08

Assigner: VulnCheck

Description
ClassroomIO through 1.0.0 contains an authorization bypass vulnerability that allows authenticated users of any organization to clone other tenants' courses via the POST /course/:courseId/clone endpoint. Attackers who know a target course id can copy its sections, lessons, exercises, and quiz answer keys into their own organization, exposing private course content.

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Meta Information

Published
2026-11-08
Last Modified
2026-11-08
Generated
2026-11-08
AI Q&A
2026-11-08
EPSS Evaluated
N/A
NVD
CVE-2026-124551
EUVD
EUVD-2026-119607

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
classroomio classroomio From 0 (inc) to 1.0.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

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Executive Summary

ClassroomIO through version 1.0.0 has an authorization bypass flaw. Authenticated users can clone courses belonging to other organizations by exploiting the POST /course/:courseId/clone endpoint. Attackers only need to know a target course ID to copy its content, including sections, lessons, exercises, and quiz answers, into their own organization.

Detection Guidance

Check for unauthorized POST requests to /course/:courseId/clone endpoints in your web server logs. Monitor for unusual course cloning activity between different organizations or tenants.

Impact Analysis

If you use ClassroomIO, attackers could steal your private course content by cloning it into their own organization. This exposes sensitive educational materials, proprietary exercises, or quiz answer keys to unauthorized parties. Organizations may face reputational damage or loss of intellectual property.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR and HIPAA by exposing private course content, including sensitive educational materials and quiz answer keys, to unauthorized users. GDPR requires protecting personal data, while HIPAA mandates safeguarding health-related information. Unauthorized access to such content violates these standards.

Mitigation Strategies

Implement proper authorization checks on the POST /course/:courseId/clone endpoint to ensure users can only clone courses within their own organization. Update ClassroomIO to the latest version if a patch is available.

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