# CVE-2011-4590: Auth bypass in n/a

> Authenticated users can bypass maintenance mode and account restrictions to access Moodle web services.

- **Severity:** Medium 4.0 (`AV:N/AC:L/Au:S/C:N/I:P/A: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:** 20 Jul 2012
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-p586-c547-p893

## What is CVE-2011-4590?

CVE-2011-4590 is a medium-severity authentication bypass vulnerability in Moodle Moodle, published on 20 Jul 2012. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The web services implementation in Moodle 2.0.x before 2.0.6 and 2.1.x before 2.1.3 does not properly consider the maintenance-mode state and account attributes during login attempts, which allows remote authenticated users to bypass intended access restrictions by connecting to a webservice server.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2011-4590?

It affects 1 product.


Products: Moodle Moodle.

## How do I fix CVE-2011-4590?

No fix has been published for CVE-2011-4590 yet. Limit exposure of the affected software until one is available.

## Is CVE-2011-4590 being exploited?

There is no known exploitation of CVE-2011-4590 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-2006-4936](https://insights.sbomify.com/CVE-2006-4936/): Moodle does not properly validate module instance id (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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-4590 and fix it if it is affected.

What it is: CVE-2011-4590 is a medium-severity authentication bypass vulnerability in Moodle Moodle, published on 20 Jul 2012. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2011-4590 in the wild and no public exploit code.

Affected product: Moodle Moodle. 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-2011-4590/ (Markdown: https://insights.sbomify.com/CVE-2011-4590/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-4590
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-4590
- OSV: https://osv.dev/vulnerability/CVE-2011-4590

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-4590/
Summaries are generated and may contain mistakes; the official description above is the record.