# CVE-2021-32157: Cross-site scripting in n/a

> An attacker can execute arbitrary scripts in the context of other users via the Scheduled Cron Jobs feature in Webmin.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **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:** No
- **Published:** 11 Apr 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-mpx2-gc6v-g7g7

## What is CVE-2021-32157?

CVE-2021-32157 is a critical cross-site scripting vulnerability in Webmin Webmin, published on 11 Apr 2022. 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

A Cross-Site Scripting (XSS) vulnerability exists in Webmin 1.973 via the Scheduled Cron Jobs feature.

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

## Which versions are affected by CVE-2021-32157?

It affects 1 product.


Products: Webmin Webmin.

## How do I fix CVE-2021-32157?

No fix has been published for CVE-2021-32157 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-32157 being exploited?

There is no known exploitation of CVE-2021-32157 in the wild and no public exploit code.

Public exploit code:

- Make it possible to build a vulnerable webmin virtual environment as a container using docker (github_poc): https://github.com/dnr6419/CVE-2021-32157
- Exploiting a Reflected Cross-Site Scripting (XSS) attack to get a Remote Command Execution (RCE) through the Webmin's Scheduled Cron Jobs feature (github_poc): https://github.com/Mesh3l911/CVE-2021-32157

## 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-2021-32157 and fix it if it is affected.

What it is: CVE-2021-32157 is a critical cross-site scripting vulnerability in Webmin Webmin, published on 11 Apr 2022. 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-2021-32157 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-2021-32157/ (Markdown: https://insights.sbomify.com/CVE-2021-32157/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32157
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32157
- OSV: https://osv.dev/vulnerability/CVE-2021-32157

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32157/
Summaries are generated and may contain mistakes; the official description above is the record.