# CVE-2023-40143: Westermo Lynx

> An attacker can inject arbitrary JavaScript into the Westermo Lynx web application via the forward.0.domain parameter, potentially compromising user sessions.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Feb 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-7xgh-8hg2-6j33

## What is CVE-2023-40143?

CVE-2023-40143 is a medium-severity cross-site scripting vulnerability in Westermo Lynx, published on 6 Feb 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An attacker with access to the Westermo Lynx web application that has the vulnerable software could introduce arbitrary JavaScript by injecting a cross-site scripting payload into the "forward.0.domain" parameter.

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

## Which versions are affected by CVE-2023-40143?

It affects 1 product.


Products: Westermo L206-F2g Firmware.

## How do I fix CVE-2023-40143?

No fix has been published for CVE-2023-40143 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-40143 being exploited?

There is no known exploitation of CVE-2023-40143 in the wild and no public exploit code.

## Other vulnerabilities in Westermo Lynx

- [CVE-2023-38579](https://insights.sbomify.com/CVE-2023-38579/): Westermo Lynx 206-F2G Cross-Site Request Forgery (high 8.0)
- [CVE-2023-45735](https://insights.sbomify.com/CVE-2023-45735/): Westermo Lynx Code Injection (high 8.0)
- [CVE-2023-45213](https://insights.sbomify.com/CVE-2023-45213/): Westermo Lynx Permissive Cross-domain Policy with Untrusted Domains (medium 6.6)
- [CVE-2023-40544](https://insights.sbomify.com/CVE-2023-40544/): Westermo Lynx Cleartext Transmission of Sensitive Information (medium 5.7)
- [CVE-2023-42765](https://insights.sbomify.com/CVE-2023-42765/): Westermo Lynx Cross-site Scripting (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-40143 and fix it if it is affected.

What it is: CVE-2023-40143 is a medium-severity cross-site scripting vulnerability in Westermo Lynx, published on 6 Feb 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-40143 in the wild and no public exploit code.

Affected product: Westermo Lynx. 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-2023-40143/ (Markdown: https://insights.sbomify.com/CVE-2023-40143/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-40143
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-40143
- OSV: https://osv.dev/vulnerability/CVE-2023-40143

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-40143/
Summaries are generated and may contain mistakes; the official description above is the record.