Auth bypass in Classroomio
CVE-2026-111369
ClassroomIO through 1.0.0 contains an incorrect authorization vulnerability in the PUT and DELETE /:lessonId lesson routes that allows any course member, including students, to modify lessons. Authenticated students can supply arbitrary lesson ids to change titles and stored HTML content or delete lessons in their course and in other courses and organizations.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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/lesso… (technical-description)
- github.com/classroomio/classroomio/blob/v1.0.0/apps/api/src/middlewares/course-… (technical-description)
- github.com/classroomio/classroomio (product)
- www.vulncheck.com/advisories/classroomio-through-1.0.0-incorrect-authorization-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111369?
- CVE-2026-111369 is a high-severity vulnerability in Classroomio, classified under Incorrect Authorization. CVSS score: 7.1/10. Published 2026-10-15.
- How severe is CVE-2026-111369?
- High severity. CVSS v3 base score is 7.1 out of 10.