# CVE-2023-41894: Local-only webhooks externally accessible via SniTun in Home Assistant Core


- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 19 Oct 2023
- **Updated:** 12 Sep 2024
- **Also known as:** GHSA-wx3j-3v2j-rf45

## What is CVE-2023-41894?

CVE-2023-41894 is a medium-severity vulnerability in home-assistant core, published on 19 Oct 2023. 

### Official description

Home assistant is an open source home automation. The assessment verified that webhooks available in the webhook component are triggerable via the `*.ui.nabu.casa` URL without authentication, even when the webhook is marked as Only accessible from the local network. This issue is facilitated by the SniTun proxy, which sets the source address to 127.0.0.1 on all requests sent to the public URL and forwarded to the local Home Assistant. This issue has been addressed in version 2023.9.0 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

Weakness: CWE-669 (Incorrect Resource Transfer Between Spheres)

## Which versions are affected by CVE-2023-41894?

It affects 1 product.


Products: Home-Assistant Home-Assistant.

## How do I fix CVE-2023-41894?

No fix has been published for CVE-2023-41894 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-41894 being exploited?

There is no known exploitation of CVE-2023-41894 in the wild and no public exploit code.

## Other vulnerabilities in home-assistant core

- [CVE-2023-27482](https://insights.sbomify.com/CVE-2023-27482/): Auth bypass in core (critical 10.0)
- [CVE-2023-41895](https://insights.sbomify.com/CVE-2023-41895/): Cross-site Scripting via auth_callback login in Home Assistant Core (high 8.8)
- [CVE-2023-41897](https://insights.sbomify.com/CVE-2023-41897/): Lack of XFO header allows clickjacking in Home Assistant Core (high 8.8)
- [CVE-2026-54317](https://insights.sbomify.com/CVE-2026-54317/): Home Assistant: Konnected alarm-panel switch state and zone topology disclosed to unauthenticated actors on the LAN (high 7.6)
- [CVE-2020-36517](https://insights.sbomify.com/CVE-2020-36517/): Information disclosure in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-41894 and fix it if it is affected.

What it is: CVE-2023-41894 is a medium-severity vulnerability in home-assistant core, published on 19 Oct 2023. 
Exploitation: There is no known exploitation of CVE-2023-41894 in the wild and no public exploit code.

Affected product: home-assistant core. 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-2023-41894/ (Markdown: https://insights.sbomify.com/CVE-2023-41894/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-41894
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-41894
- OSV: https://osv.dev/vulnerability/CVE-2023-41894

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-41894/
Summaries are generated and may contain mistakes; the official description above is the record.