# CVE-2020-9447: Cross-site Scripting in GwtUpload

> Attackers can execute arbitrary JavaScript via malicious filenames in GwtUpload, potentially stealing data or hijacking sessions.

- **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:** No
- **Published:** 28 Feb 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-5chj-xprr-7qqx

## What is CVE-2020-9447?

CVE-2020-9447 is a medium-severity cross-site scripting vulnerability in n/a, published on 28 Feb 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

There is an XSS (cross-site scripting) vulnerability in GwtUpload 1.0.3 in the file upload functionality. Someone can upload a file with a malicious filename, which contains JavaScript code, which would result in XSS. Cross-site scripting enables attackers to steal data, change the appearance of a website, and perform other malicious activities like phishing or drive-by hacking.

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

## Which versions are affected by CVE-2020-9447?

2 open source packages ship an affected version, including com.googlecode.gwtupload:gwtupload. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `com.googlecode.gwtupload:gwtupload` | Maven | All versions to 1.0.3 | None |
| `com.googlecode.gwtupload:gwtupload` | Maven | All versions to 1.0.3 | None |

Products: Gwtupload Project Gwtupload.

## How do I fix CVE-2020-9447?

No fix has been published for CVE-2020-9447 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-9447 being exploited?

There is no known exploitation of CVE-2020-9447 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-13128](https://insights.sbomify.com/CVE-2020-13128/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-9447 and fix it if it is affected.

What it is: CVE-2020-9447 is a medium-severity cross-site scripting vulnerability in n/a, published on 28 Feb 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-2020-9447 in the wild and no public exploit code.

Affected packages and fixed versions:
- com.googlecode.gwtupload:gwtupload (Maven): affected all versions up to 1.0.3; no fix listed
- com.googlecode.gwtupload:gwtupload (Maven): affected all versions up to 1.0.3; no fix listed

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-2020-9447/ (Markdown: https://insights.sbomify.com/CVE-2020-9447/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-9447
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-9447
- OSV: https://osv.dev/vulnerability/CVE-2020-9447

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-9447/
Summaries are generated and may contain mistakes; the official description above is the record.