CVE-2026-124551

ClassroomIO through 1.0.0 Cross-Organization Course Disclosure via Clone Endpoint

Published Nov 8, 2026 CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 12, 2026, 2:18 PM
Reserved
Nov 8, 2026, 1:43 PM
Status
Deferred
Published
Nov 8, 2026, 2:18 PM
Modified
Nov 12, 2026, 3:17 PM