# CVE-2025-11261: Stored i18n XSS exposed by security patch for T402077

> Stored cross-site scripting in MediaWiki allows attackers to inject malicious scripts via internationalization features, potentially compromising user sessions.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Feb 2026
- **Updated:** 3 Feb 2026
- **Also known as:** DEBIAN-CVE-2025-11261, GHSA-jrq3-c447-h584, UBUNTU-CVE-2025-11261

## What is CVE-2025-11261?

CVE-2025-11261 is a cross-site scripting vulnerability in Mediawiki Mediawiki, published on 3 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files resources/src/mediawiki.Language/mediawiki.Language.Js.

This issue affects MediaWiki: from * before 1.39.15, 1.43.5, 1.44.2.

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

## Which versions are affected by CVE-2025-11261?

It affects 1 product.


Products: Mediawiki Mediawiki.

## How do I fix CVE-2025-11261?

Upgrade to a fixed version.

## Is CVE-2025-11261 being exploited?

There is no known exploitation of CVE-2025-11261 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-2025-11261 and fix it if it is affected.

What it is: CVE-2025-11261 is a cross-site scripting vulnerability in Mediawiki Mediawiki, published on 3 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-11261 in the wild and no public exploit code.

Affected product: Mediawiki Mediawiki. 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-2025-11261/ (Markdown: https://insights.sbomify.com/CVE-2025-11261/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-11261
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-11261
- OSV: https://osv.dev/vulnerability/CVE-2025-11261

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-11261/
Summaries are generated and may contain mistakes; the official description above is the record.