# CVE-2017-0888: Cross-site scripting in Nextcloud Server

> Attackers can spoof content in the Nextcloud files app navigation bar, potentially misleading users about the displayed information.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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:** 5 Apr 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-vm7h-q75f-9ph4

## What is CVE-2017-0888?

CVE-2017-0888 is a medium-severity cross-site scripting vulnerability in Nextcloud Nextcloud Server, published on 5 Apr 2017. 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

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a Content-Spoofing vulnerability in the "files" app. The top navigation bar displayed in the files list contained partially user-controllable input leading to a potential misrepresentation of information.

Weakness: CWE-20 (Improper Input Validation), CWE-451 (User Interface (UI) Misrepresentation of Critical Information)

## Which versions are affected by CVE-2017-0888?

It affects 2 products.


Products: Nextcloud Nextcloud, Nextcloud Nextcloud Server.

## How do I fix CVE-2017-0888?

No fix has been published for CVE-2017-0888 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-0888 being exploited?

There is no known exploitation of CVE-2017-0888 in the wild and no public exploit code.

## Other vulnerabilities in Nextcloud Nextcloud Server

- [CVE-2019-5454](https://insights.sbomify.com/CVE-2019-5454/): SQL injection in com.nextcloud.client (critical 9.8)
- [CVE-2021-43863](https://insights.sbomify.com/CVE-2021-43863/): SQL Injection in FileContentProvider (GHSL-2021-1007) (high 7.5)
- [CVE-2019-5450](https://insights.sbomify.com/CVE-2019-5450/): Cross-site scripting in com.nextcloud.client (medium 6.8)
- [CVE-2019-5455](https://insights.sbomify.com/CVE-2019-5455/): Auth bypass in com.nextcloud.client (medium 6.8)
- [CVE-2021-22905](https://insights.sbomify.com/CVE-2021-22905/): Information disclosure in Nextcloud Android App (com.nextcloud.client) (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-0888 and fix it if it is affected.

What it is: CVE-2017-0888 is a medium-severity cross-site scripting vulnerability in Nextcloud Nextcloud Server, published on 5 Apr 2017. 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-2017-0888 in the wild and no public exploit code.

Affected product: Nextcloud Nextcloud Server. 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-2017-0888/ (Markdown: https://insights.sbomify.com/CVE-2017-0888/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-0888
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-0888
- OSV: https://osv.dev/vulnerability/CVE-2017-0888

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-0888/
Summaries are generated and may contain mistakes; the official description above is the record.