# CVE-2022-39221: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') McWebserver Minecraft Mod

> An attacker can read arbitrary files accessible by the server via HTTP requests due to a path traversal vulnerability in the McWebserver Minecraft mod.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Sep 2022
- **Updated:** 23 Apr 2025

## What is CVE-2022-39221?

CVE-2022-39221 is a high-severity path traversal vulnerability in J-onasJones McWebserver, published on 20 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

McWebserver mod runs a simple HTTP server alongside the Minecraft server in seperate threads. Path traversal in McWebserver Minecraft Mod for Fabric and Quilt up to and including 0.1.2.1 and McWebserver Minecraft Mod for Forge up to and including 0.1.1 allows all files, accessible by the program, to be read by anyone via HTTP request. Version 0.2.0 with patches are released to both platforms (Fabric and Quilt, Forge). As a workaround, the McWebserver mod can be disabled by removing the file from the `mods` directory.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2022-39221?

It affects 2 products.


Products: Mcwebserver Minecraft Mod for Fabric and Quilt Project Mcwebserver Minecraft Mod for Fabric and Quilt, Mcwebserver Minecraft Mod for Forge Project Mcwebserver Minecraft Mod for Forge.

## How do I fix CVE-2022-39221?

No fix has been published for CVE-2022-39221 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-39221 being exploited?

There is no known exploitation of CVE-2022-39221 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-39221 and fix it if it is affected.

What it is: CVE-2022-39221 is a high-severity path traversal vulnerability in J-onasJones McWebserver, published on 20 Sep 2022. 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-2022-39221 in the wild and no public exploit code.

Affected product: J-onasJones McWebserver. 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-2022-39221/ (Markdown: https://insights.sbomify.com/CVE-2022-39221/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-39221
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-39221
- OSV: https://osv.dev/vulnerability/CVE-2022-39221

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-39221/
Summaries are generated and may contain mistakes; the official description above is the record.