CVE-2026-111368 (CVSS 6.4)

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.

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CVSS v3.1 Score

6.4

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L

Weakness Type (CWE)

CWE-639 CWE-639

References

Other References

https://github.com/classroomio/classroomio https://github.com/classroomio/classroomio/blob/v1.0.0/apps/api/src/routes/course/submission.ts https://github.com/classroomio/classroomio/blob/v1.0.0/packages/db/src/queries/submission/submission.ts#L217-L245 https://github.com/classroomio/classroomio/commit/1844ad9671a0d9c2566d3431d82f34d39016242c https://hackmd.io/@hieuPenguinnn/classroomio-course-resource-id-scoping-idor https://www.vulncheck.com/advisories/classroomio-through-1.0.0-idor-via-course-submission-update-grade-and-delete-routes

Frequently Asked Questions

What is CVE-2026-111368? +

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. It has a CVSS v3.1 base score of 6.4 (MEDIUM).

How severe is CVE-2026-111368? +

CVE-2026-111368 has a CVSS v3.1 score of 6.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2026-111368? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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