# CVE-2026-96876: Anonymous reflected XSS in CargoExport invalid-alias errors

> An attacker can execute arbitrary scripts in a victim's browser via reflected XSS in the Cargo extension's error handling.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Sep 2026
- **Updated:** 29 Sep 2026
- **Also known as:** GHSA-vhv7-3w94-fpq6

## What is CVE-2026-96876?

CVE-2026-96876 is a medium-severity cross-site scripting vulnerability in The Wikimedia Foundation Mediawiki - Cargo extension, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Mediawiki - Cargo extension allows Reflected XSS.

This issue affects Mediawiki - Cargo extension: through 3.9.4.

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

## Which versions are affected by CVE-2026-96876?


## How do I fix CVE-2026-96876?

No fix has been published for CVE-2026-96876 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-96876 being exploited?

There is no known exploitation of CVE-2026-96876 in the wild and no public exploit code.

Public exploit code:

- Sanitized Cargo report and patch verification notes for CVE-2026-96876. (github_poc): https://github.com/BomboBombone/CVE-2026-96876

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-96876 and fix it if it is affected.

What it is: CVE-2026-96876 is a medium-severity cross-site scripting vulnerability in The Wikimedia Foundation Mediawiki - Cargo extension, published on 25 Sep 2026. 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-2026-96876 in the wild and no public exploit code.

Affected product: The Wikimedia Foundation Mediawiki - Cargo extension. 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-2026-96876/ (Markdown: https://insights.sbomify.com/CVE-2026-96876/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-96876
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-96876
- OSV: https://osv.dev/vulnerability/CVE-2026-96876

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-96876/
Summaries are generated and may contain mistakes; the official description above is the record.