# CVE-2016-4026: Cross-site scripting in n/a

> Attackers can execute malicious scripts via invalid HTML input, leading to session hijacking or unauthorized actions in Open-Xchange App Suite.

- **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:** No
- **Published:** 15 Dec 2016
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-wxjw-vgmv-8955

## What is CVE-2016-4026?

CVE-2016-4026 is a medium-severity cross-site scripting vulnerability in Open-Xchange Open-Xchange Appsuite, published on 15 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

An issue was discovered in Open-Xchange OX App Suite before 7.8.1-rev11. The content sanitizer component has an issue with filtering malicious content in case invalid HTML code is provided. In such cases the filter will output a unsanitized representation of the content. Malicious script code can be executed within a user's context. This can lead to session hijacking or triggering unwanted actions via the web interface (sending mail, deleting data etc.). Attackers can use this issue for filter evasion to inject script code later on.

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

## Which versions are affected by CVE-2016-4026?

It affects 1 product.


Products: Open-Xchange Open-Xchange Appsuite.

## How do I fix CVE-2016-4026?

No fix has been published for CVE-2016-4026 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-4026 being exploited?

There is no known exploitation of CVE-2016-4026 in the wild and no public exploit code.

## Other vulnerabilities in Open-Xchange Open-Xchange Appsuite

- [CVE-2017-13667](https://insights.sbomify.com/CVE-2017-13667/): Server-side request forgery in n/a (critical 9.9)
- [CVE-2020-12645](https://insights.sbomify.com/CVE-2020-12645/): Denial of service in n/a (critical 9.8)
- [CVE-2019-7158](https://insights.sbomify.com/CVE-2019-7158/): Missing authorization in n/a (critical 9.8)
- [CVE-2017-17060](https://insights.sbomify.com/CVE-2017-17060/): Misconfiguration in n/a (critical 9.8)
- [CVE-2017-5210](https://insights.sbomify.com/CVE-2017-5210/): Information disclosure in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-4026 and fix it if it is affected.

What it is: CVE-2016-4026 is a medium-severity cross-site scripting vulnerability in Open-Xchange Open-Xchange Appsuite, published on 15 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-2016-4026 in the wild and no public exploit code.

Affected product: Open-Xchange Open-Xchange Appsuite. 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-2016-4026/ (Markdown: https://insights.sbomify.com/CVE-2016-4026/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-4026
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-4026
- OSV: https://osv.dev/vulnerability/CVE-2016-4026

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-4026/
Summaries are generated and may contain mistakes; the official description above is the record.