# CVE-2020-10959: MediaWiki Open Redirect vulnerability

> Remote attackers can force user logout and redirect them to external sites via malicious HTML content in MediaWiki pages.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 2 Jun 2020
- **Updated:** 4 Aug 2024
- **Also known as:** BIT-mediawiki-2020-10959, GHSA-mqhw-wq8p-vf5r

## What is CVE-2020-10959?

CVE-2020-10959 is a medium-severity vulnerability in Mediawiki Mediawiki, published on 2 Jun 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

resources/src/mediawiki.page.ready/ready.js in MediaWiki before 1.35 allows remote attackers to force a logout and external redirection via HTML content in a MediaWiki page.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2020-10959?

3 open source packages ship an affected version, including mediawiki/core and mediawiki. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mediawiki/core` | Packagist | All versions | 1.34.0-rc.0 |
| `mediawiki/core` | Packagist | All versions | 1.34.0-rc.0 |
| `mediawiki` | Bitnami | All versions | 1.35.0 |

Products: Mediawiki Mediawiki.

## How do I fix CVE-2020-10959?

Upgrade mediawiki/core to 1.34.0-rc.0 or later.

## Is CVE-2020-10959 being exploited?

There is no known exploitation of CVE-2020-10959 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-2020-10959 and fix it if it is affected.

What it is: CVE-2020-10959 is a medium-severity vulnerability in Mediawiki Mediawiki, published on 2 Jun 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-10959 in the wild and no public exploit code.

Affected packages and fixed versions:
- mediawiki/core (Packagist): affected all versions; fixed in 1.34.0-rc.0
- mediawiki/core (Packagist): affected all versions; fixed in 1.34.0-rc.0
- mediawiki (Bitnami): affected all versions; fixed in 1.35.0

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-2020-10959/ (Markdown: https://insights.sbomify.com/CVE-2020-10959/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-10959
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-10959
- OSV: https://osv.dev/vulnerability/CVE-2020-10959

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-10959/
Summaries are generated and may contain mistakes; the official description above is the record.