# CVE-2016-6337: Auth bypass in n/a

> Remote attackers can bypass session access restrictions in MediaWiki by exploiting a flaw in user rights retrieval logic.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 20 Apr 2017
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2016-6337, GHSA-3c2m-8jfj-576j

## What is CVE-2016-6337?

CVE-2016-6337 is a high-severity authentication bypass vulnerability in Mediawiki Mediawiki, published on 20 Apr 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

MediaWiki 1.27.x before 1.27.1 might allow remote attackers to bypass intended session access restrictions by leveraging a call to the UserGetRights function after Session::getAllowedUserRights.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2016-6337?

It affects 1 product.


Products: Mediawiki Mediawiki.

## How do I fix CVE-2016-6337?

Upgrade to a fixed version.

## Is CVE-2016-6337 being exploited?

There is no known exploitation of CVE-2016-6337 in the wild and no public exploit code.

## Other vulnerabilities in Mediawiki Mediawiki

- [CVE-2023-37303](https://insights.sbomify.com/CVE-2023-37303/): Denial of service in n/a (critical 9.8)
- [CVE-2022-29904](https://insights.sbomify.com/CVE-2022-29904/): SQL injection in n/a (critical 9.8)
- [CVE-2022-29906](https://insights.sbomify.com/CVE-2022-29906/): Missing authorization in n/a (critical 9.8)
- [CVE-2022-28205](https://insights.sbomify.com/CVE-2022-28205/): Business logic in n/a (critical 9.8)
- [CVE-2022-28206](https://insights.sbomify.com/CVE-2022-28206/): Missing authorization in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-6337 and fix it if it is affected.

What it is: CVE-2016-6337 is a high-severity authentication bypass vulnerability in Mediawiki Mediawiki, published on 20 Apr 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2016-6337 in the wild and no public exploit code.

Affected product: Mediawiki Mediawiki. 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-2016-6337/ (Markdown: https://insights.sbomify.com/CVE-2016-6337/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-6337
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-6337
- OSV: https://osv.dev/vulnerability/CVE-2016-6337

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-6337/
Summaries are generated and may contain mistakes; the official description above is the record.