# CVE-2024-54138: XSS Vulnerability in NuGetGallery's Markdown Autolinks Processing

> Attackers can execute arbitrary scripts via unsanitized Markdown autolinks in NuGet Gallery, potentially compromising user sessions.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/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:** 6 Dec 2024
- **Updated:** 10 Dec 2024
- **Also known as:** GHSA-x448-p234-x5p8

## What is CVE-2024-54138?

CVE-2024-54138 is a medium-severity cross-site scripting vulnerability in NuGetGallery, published on 6 Dec 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

NuGet Gallery is a package repository that powers nuget.org. The NuGetGallery has a security vulnerability related to its handling of autolinks in Markdown content. While the platform properly filters out JavaScript from standard links, it does not adequately sanitize autolinks. This oversight allows attackers to exploit autolinks as a vector for Cross-Site Scripting (XSS) attacks. This vulnerability is fixed in 2024.12.06.

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

## Which versions are affected by CVE-2024-54138?

It affects 1 product.


Products: Microsoft Nugetgallery.

## How do I fix CVE-2024-54138?

No fix has been published for CVE-2024-54138 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-54138 being exploited?

There is no known exploitation of CVE-2024-54138 in the wild and no public exploit code.

## Other vulnerabilities in NuGetGallery

- [CVE-2024-47604](https://insights.sbomify.com/CVE-2024-47604/): XSS vulnerability in NuGetGallery HTML attributes handling (high 8.2)
- [CVE-2024-37304](https://insights.sbomify.com/CVE-2024-37304/): NuGetGallery's Markdown Autolinks Processing Vulnerable to Cross-site Scripting (medium 6.1)
- [CVE-2020-1340](https://insights.sbomify.com/CVE-2020-1340/): Cross-site scripting in NuGetGallery (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-54138 and fix it if it is affected.

What it is: CVE-2024-54138 is a medium-severity cross-site scripting vulnerability in NuGetGallery, published on 6 Dec 2024. 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-2024-54138 in the wild and no public exploit code.

Affected product: NuGetGallery. 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-2024-54138/ (Markdown: https://insights.sbomify.com/CVE-2024-54138/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-54138
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-54138
- OSV: https://osv.dev/vulnerability/CVE-2024-54138

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-54138/
Summaries are generated and may contain mistakes; the official description above is the record.