# CVE-2020-26121: Missing authorization in n/a

> Attackers can bypass page creation restrictions to create pages with disallowed titles in MediaWiki using the FileImporter extension.

- **Severity:** High 7.5 (`CVSS:3.1/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:** 27 Sep 2020
- **Updated:** 4 Aug 2024
- **Also known as:** BIT-mediawiki-2020-26121, GHSA-2pxh-883j-pqvh

## What is CVE-2020-26121?

CVE-2020-26121 is a high-severity missing authorization vulnerability in Fedoraproject Fedora, published on 27 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in the FileImporter extension for MediaWiki before 1.34.4. An attacker can import a file even when the target page is protected against "page creation" and the attacker should not be able to create it. This occurs because of a mishandled distinction between an upload restriction and a create restriction. An attacker cannot leverage this to overwrite anything, but can leverage this to force a wiki to have a page with a disallowed title.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2020-26121?

1 open source package ship an affected version, including mediawiki. It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mediawiki` | Bitnami | All versions | 1.34.4 |

Products: Fedoraproject Fedora, Mediawiki Mediawiki.

## How do I fix CVE-2020-26121?

Upgrade mediawiki to 1.34.4 or later.

## Is CVE-2020-26121 being exploited?

There is no known exploitation of CVE-2020-26121 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-26121 and fix it if it is affected.

What it is: CVE-2020-26121 is a high-severity missing authorization vulnerability in Fedoraproject Fedora, published on 27 Sep 2020. 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-2020-26121 in the wild and no public exploit code.

Affected packages and fixed versions:
- mediawiki (Bitnami): affected all versions; fixed in 1.34.4

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-2020-26121/ (Markdown: https://insights.sbomify.com/CVE-2020-26121/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-26121
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-26121
- OSV: https://osv.dev/vulnerability/CVE-2020-26121

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-26121/
Summaries are generated and may contain mistakes; the official description above is the record.