# CVE-2017-7739: Cross-site scripting in FortiOS

> An unauthenticated attacker can inject arbitrary web script into FortiOS web proxy disclaimer pages via a crafted URL, potentially compromising user sessions.

- **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:** 13 Nov 2017
- **Updated:** 25 Oct 2024
- **Also known as:** GHSA-w98v-r22j-8p88

## What is CVE-2017-7739?

CVE-2017-7739 is a medium-severity cross-site scripting vulnerability in Fortinet Fortios, published on 13 Nov 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

A reflected Cross-site Scripting (XSS) vulnerability in web proxy disclaimer response web pages in Fortinet FortiOS 5.6.0, 5.4.0 to 5.4.5, 5.2.0 to 5.2.11 allows an unauthenticated attacker to inject arbitrary web script or HTML in the context of the victim's browser via sending a maliciously crafted URL to the victim.

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

## Which versions are affected by CVE-2017-7739?

It affects 1 product.


Products: Fortinet Fortios.

## How do I fix CVE-2017-7739?

No fix has been published for CVE-2017-7739 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-7739 being exploited?

There is no known exploitation of CVE-2017-7739 in the wild and no public exploit code.

## Other vulnerabilities in Fortinet Fortios

- [CVE-2024-23113](https://insights.sbomify.com/CVE-2024-23113/): Fortinet Multiple Products Format String (critical 9.8, exploited in the wild)
- [CVE-2022-40684](https://insights.sbomify.com/CVE-2022-40684/): Fortinet Multiple Products Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2024-55591](https://insights.sbomify.com/CVE-2024-55591/): Fortinet FortiOS and FortiProxy Authentication Bypass (critical 9.6, exploited in the wild)
- [CVE-2024-21762](https://insights.sbomify.com/CVE-2024-21762/): Fortinet FortiOS Out-of-Bound Write (critical 9.6, exploited in the wild)
- [CVE-2022-42475](https://insights.sbomify.com/CVE-2022-42475/): Fortinet FortiOS Heap-Based Buffer Overflow (critical 9.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-7739 and fix it if it is affected.

What it is: CVE-2017-7739 is a medium-severity cross-site scripting vulnerability in Fortinet Fortios, published on 13 Nov 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-2017-7739 in the wild and no public exploit code.

Affected product: Fortinet Fortios. 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-2017-7739/ (Markdown: https://insights.sbomify.com/CVE-2017-7739/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-7739
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-7739
- OSV: https://osv.dev/vulnerability/CVE-2017-7739

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-7739/
Summaries are generated and may contain mistakes; the official description above is the record.