# CVE-2020-12670: Cross-site scripting in n/a

> Attackers can execute arbitrary JavaScript via unsanitized HTML emails in Webmin's Read User Email module, potentially compromising user accounts.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **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-xjf8-qhj9-9w5r

## What is CVE-2020-12670?

CVE-2020-12670 is a medium-severity cross-site scripting vulnerability in Webmin Webmin, published on 12 Oct 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

XSS exists in Webmin 1.941 and earlier affecting the Save function of the Read User Email Module / mailboxes Endpoint when attempting to save HTML emails. This module parses any output without sanitizing SCRIPT elements, as opposed to the View function, which sanitizes the input correctly. A malicious user can send any JavaScript payload into the message body and execute it if the user decides to save that email.

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

## Which versions are affected by CVE-2020-12670?

It affects 1 product.


Products: Webmin Webmin.

## How do I fix CVE-2020-12670?

Upgrade to a fixed version.

## Is CVE-2020-12670 being exploited?

There is no known exploitation of CVE-2020-12670 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-2020-12670 and fix it if it is affected.

What it is: CVE-2020-12670 is a medium-severity cross-site scripting vulnerability in Webmin Webmin, published on 12 Oct 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-12670 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-2020-12670/ (Markdown: https://insights.sbomify.com/CVE-2020-12670/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-12670
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-12670
- OSV: https://osv.dev/vulnerability/CVE-2020-12670

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-12670/
Summaries are generated and may contain mistakes; the official description above is the record.