Auth bypass in Classroomio
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/classroomio-course-resource-id-scoping-idor (third-party-advisory)
- github.com/classroomio/classroomio/blob/v1.0.0/apps/api/src/routes/course/submi… (technical-description)
- github.com/classroomio/classroomio/blob/v1.0.0/packages/db/src/queries/submissi… (technical-description)
- github.com/classroomio/classroomio/commit/1844ad9671a0d9c2566d3431d82f34d390162… (patch)
- github.com/classroomio/classroomio (product)
- www.vulncheck.com/advisories/classroomio-through-1.0.0-idor-via-course-submissi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111368?
- CVE-2026-111368 is a medium-severity vulnerability in Classroomio, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.4/10. Published 2026-10-15.
- How severe is CVE-2026-111368?
- Medium severity. CVSS v3 base score is 6.4 out of 10.