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.
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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

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

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.