# CVE-2026-111368: ClassroomIO through 1.0.0 IDOR via Course Submission Update, Grade and Delete Routes

> Attackers can modify or delete course submissions in other courses by manipulating course IDs, leading to unauthorized data changes.

- **Severity:** Medium 6.1 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-j6jm-jc5p-v7pp

## What is CVE-2026-111368?

CVE-2026-111368 is a medium-severity missing authorization vulnerability in ClassroomIO, published on 15 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-111368?


## How do I fix CVE-2026-111368?

No fix has been published for CVE-2026-111368 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-111368 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111368 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-111368 and fix it if it is affected.

What it is: CVE-2026-111368 is a medium-severity missing authorization vulnerability in ClassroomIO, published on 15 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111368 exists.

Affected product: ClassroomIO. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-111368/ (Markdown: https://insights.sbomify.com/CVE-2026-111368/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-111368
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111368
- OSV: https://osv.dev/vulnerability/CVE-2026-111368

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-111368/
Summaries are generated and may contain mistakes; the official description above is the record.