# CVE-2020-8820: Cross-site scripting in n/a

> Attackers can inject malicious scripts into the Cluster Shell Commands field, leading to code execution or account takeover when the menu is revisited.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 12 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-fcgp-r4vf-4x3h

## What is CVE-2020-8820?

CVE-2020-8820 is a medium-severity cross-site scripting vulnerability in Webmin Webmin, published on 12 Oct 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

An XSS Vulnerability exists in Webmin 1.941 and earlier affecting the Cluster Shell Commands Endpoint. A user may enter any XSS Payload into the Command field and execute it. Then, after revisiting the Cluster Shell Commands Menu, the XSS Payload will be rendered and executed.

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

## Which versions are affected by CVE-2020-8820?

It affects 1 product.


Products: Webmin Webmin.

## How do I fix CVE-2020-8820?

Upgrade to a fixed version.

## Is CVE-2020-8820 being exploited?

There is no known exploitation of CVE-2020-8820 in the wild and no public exploit code.

## Other vulnerabilities in Webmin Webmin

- [CVE-2019-15107](https://insights.sbomify.com/CVE-2019-15107/): Webmin Command Injection (critical 9.8, exploited in the wild)
- [CVE-2002-2201](https://insights.sbomify.com/CVE-2002-2201/): Command injection in n/a (critical 10.0)
- [CVE-2001-1196](https://insights.sbomify.com/CVE-2001-1196/): Path traversal in n/a (critical 10.0)
- [CVE-2024-12828](https://insights.sbomify.com/CVE-2024-12828/): Webmin CGI Command Injection Remote Code Execution Vulnerability (critical 9.9)
- [CVE-2022-36446](https://insights.sbomify.com/CVE-2022-36446/): Cross-site scripting in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-8820 and fix it if it is affected.

What it is: CVE-2020-8820 is a medium-severity cross-site scripting vulnerability in Webmin Webmin, published on 12 Oct 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-8820 in the wild and no public exploit code.

Affected product: Webmin Webmin. 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-2020-8820/ (Markdown: https://insights.sbomify.com/CVE-2020-8820/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-8820
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-8820
- OSV: https://osv.dev/vulnerability/CVE-2020-8820

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-8820/
Summaries are generated and may contain mistakes; the official description above is the record.