# CVE-2021-30153: Information disclosure in n/a

> Attackers can determine if hidden user accounts exist by editing their user pages with VisualEditor, leaking private user status.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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:** Yes
- **Published:** 15 Apr 2023
- **Updated:** 6 Feb 2025
- **Also known as:** BIT-mediawiki-2021-30153, DEBIAN-CVE-2021-30153, GHSA-fr28-p2jh-93mm

## What is CVE-2021-30153?

CVE-2021-30153 is a medium-severity vulnerability in Mediawiki Mediawiki, published on 15 Apr 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An issue was discovered in the VisualEditor extension in MediaWiki before 1.31.13, and 1.32.x through 1.35.x before 1.35.2. . When using VisualEditor to edit a MediaWiki user page belonging to an existing, but hidden, user, VisualEditor will disclose that the user exists. (It shouldn't because they are hidden.) This is related to ApiVisualEditor.

Weakness: CWE-668 (Exposure of Resource to Wrong Sphere)

## Which versions are affected by CVE-2021-30153?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mediawiki` | Bitnami | All versions | 1.31.13, 1.35.2 |

Products: Mediawiki Mediawiki.

## How do I fix CVE-2021-30153?

Upgrade mediawiki to a fixed version for your release line: 1.31.13 or 1.35.2.

## Is CVE-2021-30153 being exploited?

There is no known exploitation of CVE-2021-30153 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-2021-30153 and fix it if it is affected.

What it is: CVE-2021-30153 is a medium-severity vulnerability in Mediawiki Mediawiki, published on 15 Apr 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-30153 in the wild and no public exploit code.

Affected packages and fixed versions:
- mediawiki (Bitnami): affected all versions; fixed in 1.31.13, 1.35.2

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-2021-30153/ (Markdown: https://insights.sbomify.com/CVE-2021-30153/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-30153
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-30153
- OSV: https://osv.dev/vulnerability/CVE-2021-30153

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-30153/
Summaries are generated and may contain mistakes; the official description above is the record.