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.

Attack Vector Network

Attack Complexity High

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
classroomio classroomio unaffected
Version Status Constraints
0 affected ≤ 1.0.0

No data.

No data.

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Project Subscriptions

Vendors Products
Classroomio Subscribe
Classroomio Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/classroomio/classroomio cve-icon cve-icon
https://github.com/classroomio/classroomio/blob/v1.0.0/apps/api/src/routes/course/course.ts#L584-L612 cve-icon cve-icon
https://github.com/classroomio/classroomio/blob/v1.0.0/apps/api/src/services/course/clone.ts#L202-L290 cve-icon cve-icon
https://github.com/classroomio/classroomio/commit/6630b73f8d53e316de6f575a170b093da6bf3cca cve-icon cve-icon
https://github.com/classroomio/classroomio/issues/1414 cve-icon cve-icon
https://hackmd.io/@hieuPenguinnn/classroomio-course-clone-cross-org-content-exfiltration cve-icon cve-icon
https://www.vulncheck.com/advisories/classroomio-through-1.0.0-cross-organization-course-disclosure-via-clone-endpoint cve-icon cve-icon
History

Sun, 08 Nov 2026 14:00:00 +0000

Type Values Removed Values Added
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.
Title ClassroomIO through 1.0.0 Cross-Organization Course Disclosure via Clone Endpoint
First Time appeared Classroomio
Classroomio classroomio
Weaknesses CWE-639
CPEs cpe:2.3:a:classroomio:classroomio:*:*:*:*:*:*:*:*
Vendors & Products Classroomio
Classroomio classroomio
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-08T13:52:34.322Z

Reserved: 2026-11-08T13:43:23.426Z

Link: CVE-2026-124551

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-11-08T14:18:19.417

Modified: 2026-11-08T14:18:19.547

Link: CVE-2026-124551

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-08T15:30:16Z

Weaknesses