# CVE-2021-46150: Cross-site scripting in n/a

> Cross-site scripting in MediaWiki's CheckUserLog allows attackers to execute arbitrary scripts via date mishandling, potentially compromising user accounts.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 7 Jan 2022
- **Updated:** 4 Aug 2024
- **Also known as:** BIT-mediawiki-2021-46150, GHSA-74qj-pmvq-g8v5

## What is CVE-2021-46150?

CVE-2021-46150 is a medium-severity cross-site scripting vulnerability in Mediawiki Mediawiki, published on 7 Jan 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. Special:CheckUserLog allows CheckUser XSS because of date mishandling, as demonstrated by an XSS payload in MediaWiki:October.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-46150?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mediawiki` | Bitnami | All versions | 1.35.5, 1.36.3, 1.37.1 |

Products: Mediawiki Mediawiki.

## How do I fix CVE-2021-46150?

Upgrade mediawiki to a fixed version for your release line: 1.35.5, 1.36.3 or 1.37.1.

## Is CVE-2021-46150 being exploited?

There is no known exploitation of CVE-2021-46150 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-2021-46150 and fix it if it is affected.

What it is: CVE-2021-46150 is a medium-severity cross-site scripting vulnerability in Mediawiki Mediawiki, published on 7 Jan 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-46150 in the wild and no public exploit code.

Affected packages and fixed versions:
- mediawiki (Bitnami): affected all versions; fixed in 1.35.5, 1.36.3, 1.37.1

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-2021-46150/ (Markdown: https://insights.sbomify.com/CVE-2021-46150/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-46150
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-46150
- OSV: https://osv.dev/vulnerability/CVE-2021-46150

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-46150/
Summaries are generated and may contain mistakes; the official description above is the record.