CVE-2026-111368
ClassroomIO through 1.0.0 IDOR via Course Submission Update, Grade and Delete Routes
- State
- Published
- Severity
- 6.1 Medium
- Published
- Oct 15, 2026
- Updated
- Oct 16, 2026
- Reserved
- Oct 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.1 Medium | 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 | VulnCheck |
| 3.1 | 6.4 Medium | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L | VulnCheck |
Weaknesses
- CWE-639 Authorization Bypass Through User-Controlled Key
Affected Products
| Product | Versions |
|---|---|
ClassroomIOclassroomio |
|
References
- https://hackmd.io/@hieuPenguinnn/classroomio-course-resource-id-scoping-idorthird-party-advisory
- https://github.com/classroomio/classroomio/blob/v1.0.0/apps/api/src/routes/course/submission.tstechnical-description
- https://github.com/classroomio/classroomio/blob/v1.0.0/packages/db/src/queries/submission/submission.ts#L217-L245technical-description
- https://github.com/classroomio/classroomio/commit/1844ad9671a0d9c2566d3431d82f34d39016242cpatch
- https://github.com/classroomio/classroomioproduct
- VulnCheck Advisory: ClassroomIO through 1.0.0 IDOR via Course Submission Update, Grade and Delete Routesthird-party-advisory
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