# CVE-2025-25287: Lakeus vulnerable to stored XSS via system messages

> Attackers with editinterface rights can inject malicious HTML into system messages, leading to stored XSS affecting users who enable specific features or view footers.

- **Severity:** Medium 4.7 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Feb 2025
- **Updated:** 21 Jul 2025
- **Also known as:** GHSA-mq77-3q68-v64v

## What is CVE-2025-25287?

CVE-2025-25287 is a medium-severity cross-site scripting vulnerability in lakejason0 mediawiki-skins-Lakeus, published on 13 Feb 2025. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Lakeus is a simple skin made for MediaWiki. Starting in version 1.0.8 and prior to versions 1.3.1+REL1.39, 1.3.1+REL1.42, and 1.4.0, Lakeus is vulnerable to store cross-site scripting via malicious system messages, though editing the messages requires high privileges. Those with `(editinterface)` rights can edit system messages that are improperly handled in order to send raw HTML. In the case of `lakeus-footermessage`, this will affect all users if the server is configured to link back to this repository. Otherwise, the system messages in themeDesigner.js are only used when the user enables it in their preferences. Versions 1.3.1+REL1.39, 1.3.1+REL1.42, and 1.4.0 contain a patch.

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

## Which versions are affected by CVE-2025-25287?


## How do I fix CVE-2025-25287?

No fix has been published for CVE-2025-25287 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-25287 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-25287 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-25287 and fix it if it is affected.

What it is: CVE-2025-25287 is a medium-severity cross-site scripting vulnerability in lakejason0 mediawiki-skins-Lakeus, published on 13 Feb 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-25287 exists.

Affected product: lakejason0 mediawiki-skins-Lakeus. 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-2025-25287/ (Markdown: https://insights.sbomify.com/CVE-2025-25287/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-25287
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-25287
- OSV: https://osv.dev/vulnerability/CVE-2025-25287

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-25287/
Summaries are generated and may contain mistakes; the official description above is the record.