ClassroomIO through 1.0.0 contains an insecure direct object reference vulnerability in the Hono API course submission routes that allows course tutors or admins to modify submissions in other courses. Attackers can supply their own course id with another course's submission UUID to PUT or DELETE handlers to overwrite answers, grades, feedback, and grading status or delete submissions.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact Low

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 High

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

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 0.00232.

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.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

No data.

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/submission.ts cve-icon cve-icon
https://github.com/classroomio/classroomio/blob/v1.0.0/packages/db/src/queries/submission/submission.ts#L217-L245 cve-icon cve-icon
https://github.com/classroomio/classroomio/commit/1844ad9671a0d9c2566d3431d82f34d39016242c 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-idor-via-course-submission-update-grade-and-delete-routes cve-icon cve-icon
History

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

Type Values Removed Values Added
Description ClassroomIO through 1.0.0 contains an insecure direct object reference vulnerability in the Hono API course submission routes that allows course tutors or admins to modify submissions in other courses. Attackers can supply their own course id with another course's submission UUID to PUT or DELETE handlers to overwrite answers, grades, feedback, and grading status or delete submissions.
Title ClassroomIO through 1.0.0 IDOR via Course Submission Update, Grade and Delete Routes
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': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L'}

cvssV4_0

{'score': 6.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-16T14:14:38.123Z

Reserved: 2026-10-15T21:21:27.275Z

Link: CVE-2026-111368

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-15T22:19:34.847

Modified: 2026-10-16T14:17:22.740

Link: CVE-2026-111368

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-16T13:44:00Z

Weaknesses