# CVE-2021-29483: wikiconfig API leaked private config variables set through ManageWiki

> The wikiconfig API exposed private configuration variables to all users, allowing unauthorized data access in MediaWiki installations using ManageWiki.

- **Severity:** Critical 9.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-jmc9-rv2f-g8vv

## What is CVE-2021-29483?

CVE-2021-29483 is a critical vulnerability in miraheze ManageWiki, published on 28 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ManageWiki is an extension to the MediaWiki project. The 'wikiconfig' API leaked the value of private configuration variables set through the ManageWiki variable to all users. This has been patched by https://github.com/miraheze/ManageWiki/compare/99f3b2c8af18...befb83c66f5b.patch. If you are unable to patch set `$wgAPIListModules['wikiconfig'] = 'ApiQueryDisabled';` or remove private config as a workaround.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2021-29483?

It affects 1 product.


Products: Miraheze Managewiki.

## How do I fix CVE-2021-29483?

No fix has been published for CVE-2021-29483 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-29483 being exploited?

There is no known exploitation of CVE-2021-29483 in the wild and no public exploit code.

## Other vulnerabilities in miraheze ManageWiki

- [CVE-2025-32956](https://insights.sbomify.com/CVE-2025-32956/): ManageWiki has SQL injection vulnerability in NamespaceMigrationJob (high 8.0)
- [CVE-2024-25109](https://insights.sbomify.com/CVE-2024-25109/): Cross-Site Scripting in the extensions, settings, permissions and namespaces subpages of ManageWiki (medium 6.5)
- [CVE-2025-32964](https://insights.sbomify.com/CVE-2025-32964/): Missing authorization in ManageWiki (medium 4.6)
- [CVE-2025-43861](https://insights.sbomify.com/CVE-2025-43861/): ManageWiki Vulnerable to Self-XSS in review dialog via unsanitized field reflection (medium 4.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-29483 and fix it if it is affected.

What it is: CVE-2021-29483 is a critical vulnerability in miraheze ManageWiki, published on 28 Apr 2021. 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-2021-29483 in the wild and no public exploit code.

Affected product: miraheze ManageWiki. 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-2021-29483/ (Markdown: https://insights.sbomify.com/CVE-2021-29483/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-29483
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-29483
- OSV: https://osv.dev/vulnerability/CVE-2021-29483

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-29483/
Summaries are generated and may contain mistakes; the official description above is the record.