ClassroomIO through 1.0.0 contains an incorrect authorization vulnerability in the PUT and DELETE /:lessonId lesson routes that allows any course member, including students, to modify lessons. Authenticated students can supply arbitrary lesson ids to change titles and stored HTML content or delete lessons in their course and in other courses and organizations.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00246.

Exploitation none

Automatable no

Technical Impact partial

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/middlewares/course-member.ts cve-icon cve-icon
https://github.com/classroomio/classroomio/blob/v1.0.0/apps/api/src/routes/course/lesson.ts#L107-L152 cve-icon cve-icon
https://hackmd.io/@hieuPenguinnn/classroomio-course-resource-id-scoping-idor cve-icon cve-icon
https://www.vulncheck.com/advisories/classroomio-through-1.0.0-incorrect-authorization-via-lesson-update-and-delete-routes cve-icon cve-icon
History

Fri, 16 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 15 Oct 2026 22:00:00 +0000

Type Values Removed Values Added
Description ClassroomIO through 1.0.0 contains an incorrect authorization vulnerability in the PUT and DELETE /:lessonId lesson routes that allows any course member, including students, to modify lessons. Authenticated students can supply arbitrary lesson ids to change titles and stored HTML content or delete lessons in their course and in other courses and organizations.
Title ClassroomIO through 1.0.0 Incorrect Authorization via Lesson Update and Delete Routes
First Time appeared Classroomio
Classroomio classroomio
Weaknesses CWE-863
CPEs cpe:2.3:a:classroomio:classroomio:*:*:*:*:*:*:*:*
Vendors & Products Classroomio
Classroomio classroomio
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-16T17:08:02.709Z

Reserved: 2026-10-15T21:21:32.069Z

Link: CVE-2026-111369

cve-icon Vulnrichment

Updated: 2026-10-16T16:31:48.754Z

cve-icon NVD

Status : Deferred

Published: 2026-10-15T22:19:35.013

Modified: 2026-10-16T18:25:45.343

Link: CVE-2026-111369

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-16T16:30:13Z

Weaknesses