# CVE-2016-5303: Cross-site scripting in n/a

> Remote attackers can inject arbitrary web script or HTML via crafted data:text/html content in form attributes, affecting Horde Groupware users.

- **Severity:** Medium 6.1 (`CVSS:3.0/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:** 20 Dec 2016
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2016-5303, GHSA-6mv9-x42q-f8qh, UBUNTU-CVE-2016-5303

## What is CVE-2016-5303?

CVE-2016-5303 is a medium-severity cross-site scripting vulnerability in n/a, published on 20 Dec 2016. 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

Cross-site scripting (XSS) vulnerability in the Horde Text Filter API in Horde Groupware and Horde Groupware Webmail Edition before 5.2.16 allows remote attackers to inject arbitrary web script or HTML via crafted data:text/html content in a form (1) action or (2) xlink attribute.

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

## Which versions are affected by CVE-2016-5303?

It affects 1 product.


Products: Horde Groupware.

## How do I fix CVE-2016-5303?

Upgrade to a fixed version.

## Is CVE-2016-5303 being exploited?

There is no known exploitation of CVE-2016-5303 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2008-7218](https://insights.sbomify.com/CVE-2008-7218/): Other in n/a (critical 10.0)
- [CVE-2008-7219](https://insights.sbomify.com/CVE-2008-7219/): Missing authorization in n/a (critical 10.0)
- [CVE-2019-12095](https://insights.sbomify.com/CVE-2019-12095/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2017-7413](https://insights.sbomify.com/CVE-2017-7413/): Command injection in n/a (high 8.8)
- [CVE-2017-15235](https://insights.sbomify.com/CVE-2017-15235/): Auth bypass in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-5303 and fix it if it is affected.

What it is: CVE-2016-5303 is a medium-severity cross-site scripting vulnerability in n/a, published on 20 Dec 2016. 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-2016-5303 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-2016-5303/ (Markdown: https://insights.sbomify.com/CVE-2016-5303/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-5303
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-5303
- OSV: https://osv.dev/vulnerability/CVE-2016-5303

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-5303/
Summaries are generated and may contain mistakes; the official description above is the record.