# CVE-2006-4936: Moodle does not properly validate module instance id

> Insufficient validation of module instance IDs in Moodle allows attackers to bypass authorization checks, potentially leading to privilege escalation or unauthorized data modification.

- **Severity:** Critical 10.0 (`AV:N/AC:L/Au:N/C:C/I:C/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Sep 2006
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-h9w8-4376-j344

## What is CVE-2006-4936?

CVE-2006-4936 is a critical missing authorization vulnerability in Moodle Moodle, published on 23 Sep 2006. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Moodle before 1.6.2 does not properly validate the module instance id when creating a course module object, which has unspecified impact and remote attack vectors.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2006-4936?

2 open source packages ship an affected version, including moodle/moodle. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `moodle/moodle` | Packagist | All versions | 1.6.2 |
| `moodle/moodle` | Packagist | All versions | 1.6.2 |

Products: Moodle Moodle.

## How do I fix CVE-2006-4936?

Upgrade moodle/moodle to 1.6.2 or later.

## Is CVE-2006-4936 being exploited?

There is no known exploitation of CVE-2006-4936 in the wild and no public exploit code.

## Other vulnerabilities in Moodle Moodle

- [CVE-2006-4935](https://insights.sbomify.com/CVE-2006-4935/): File upload in n/a (critical 10.0)
- [CVE-2004-2233](https://insights.sbomify.com/CVE-2004-2233/): Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors. (critical 10.0)
- [CVE-2004-2235](https://insights.sbomify.com/CVE-2004-2235/): Cross-site scripting in n/a (critical 10.0)
- [CVE-2004-2236](https://insights.sbomify.com/CVE-2004-2236/): Other in n/a (critical 10.0)
- [CVE-2004-2237](https://insights.sbomify.com/CVE-2004-2237/): Unknown vulnerability in Moodle before 1.3.4 has unknown impact and attack vectors, related to "strings in Moodle texts." (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-4936 and fix it if it is affected.

What it is: CVE-2006-4936 is a critical missing authorization vulnerability in Moodle Moodle, published on 23 Sep 2006. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2006-4936 in the wild and no public exploit code.

Affected packages and fixed versions:
- moodle/moodle (Packagist): affected all versions; fixed in 1.6.2
- moodle/moodle (Packagist): affected all versions; fixed in 1.6.2

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-2006-4936/ (Markdown: https://insights.sbomify.com/CVE-2006-4936/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-4936
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-4936
- OSV: https://osv.dev/vulnerability/CVE-2006-4936

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-4936/
Summaries are generated and may contain mistakes; the official description above is the record.