# CVE-2016-1566: Cross-site scripting in n/a

> Authenticated attackers can inject scripts via crafted filenames in Guacamole's file browser when shared transfers are enabled.

- **Severity:** Medium 5.4 (`CVSS:3.0/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:** No
- **Published:** 2 Feb 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-h3fg-gg9m-6pp2

## What is CVE-2016-1566?

CVE-2016-1566 is a medium-severity cross-site scripting vulnerability in n/a, published on 2 Feb 2017. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Cross-site scripting (XSS) vulnerability in the file browser in Guacamole 0.9.8 and 0.9.9, when file transfer is enabled to a location shared by multiple users, allows remote authenticated users to inject arbitrary web script or HTML via a crafted filename.  NOTE: this vulnerability was fixed in guacamole.war on 2016-01-13, but the version number was not changed.

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

## Which versions are affected by CVE-2016-1566?

It affects 1 product.


Products: Apache Guacamole.

## How do I fix CVE-2016-1566?

No fix has been published for CVE-2016-1566 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-1566 being exploited?

There is no known exploitation of CVE-2016-1566 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-43999](https://insights.sbomify.com/CVE-2021-43999/): Improper validation of SAML responses (high 8.8)
- [CVE-2017-3158](https://insights.sbomify.com/CVE-2017-3158/): Apache Guacamole Race Condition vulnerability (high 8.1)
- [CVE-2023-43826](https://insights.sbomify.com/CVE-2023-43826/): Apache Guacamole: Integer overflow in handling of VNC image buffers (high 7.5)
- [CVE-2019-19603](https://insights.sbomify.com/CVE-2019-19603/): Null dereference in n/a (high 7.5)
- [CVE-2018-1340](https://insights.sbomify.com/CVE-2018-1340/): Missing Encryption of Sensitive Data in Apache Guacamole (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-1566 and fix it if it is affected.

What it is: CVE-2016-1566 is a medium-severity cross-site scripting vulnerability in n/a, published on 2 Feb 2017. 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-2016-1566 in the wild and no public exploit code.

Affected product: n/a. 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-2016-1566/ (Markdown: https://insights.sbomify.com/CVE-2016-1566/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-1566
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-1566
- OSV: https://osv.dev/vulnerability/CVE-2016-1566

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-1566/
Summaries are generated and may contain mistakes; the official description above is the record.