Vulnerability DatabaseCVE-2026-111368
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CVE-2026-111368
Published:October 15, 2026
Updated:October 20, 2026
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.
Related Resources (8)
https://github.com/classroomio/classroomio
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111368.json
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
https://nvd.nist.gov/vuln/detail/CVE-2026-111368
https://github.com/classroomio/classroomio/blob/v1.0.0/packages/db/src/queries/submission/submission.ts#L217-L245
https://github.com/classroomio/classroomio/blob/v1.0.0/apps/api/src/routes/course/submission.ts
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CVSS v4
Base Score:
6.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.4
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key
CWE-639
EPSS
Base Score:
0.23