# CVE-2021-22122: Cross-site scripting in Fortinet FortiWeb

> Unauthenticated remote attackers can execute reflected cross-site scripting attacks via malicious payloads in FortiWeb GUI API endpoints.

- **Severity:** Medium 6.1 (`CVSS:3.1/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:** 8 Feb 2021
- **Updated:** 25 Oct 2024
- **Also known as:** GHSA-6xx4-8wj3-477v

## What is CVE-2021-22122?

CVE-2021-22122 is a medium-severity cross-site scripting vulnerability in Fortinet Fortiweb, published on 8 Feb 2021. 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 improper neutralization of input during web page generation in FortiWeb GUI interface 6.3.0 through 6.3.7 and version before 6.2.4 may allow an unauthenticated, remote attacker to perform a reflected cross site scripting attack (XSS) by injecting malicious payload in different vulnerable API end-points.

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

## Which versions are affected by CVE-2021-22122?

It affects 1 product.


Products: Fortinet Fortiweb.

## How do I fix CVE-2021-22122?

No fix has been published for CVE-2021-22122 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22122 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-22122 exists.

Public exploit code:

- FortiWeb - Cross Site Scripting (nuclei): http/cves/2021/CVE-2021-22122.yaml

## Other vulnerabilities in Fortinet Fortiweb

- [CVE-2025-25257](https://insights.sbomify.com/CVE-2025-25257/): Fortinet FortiWeb SQL Injection (critical 9.6, exploited in the wild)
- [CVE-2025-64446](https://insights.sbomify.com/CVE-2025-64446/): Fortinet FortiWeb Path Traversal (critical 9.4, exploited in the wild)
- [CVE-2025-58034](https://insights.sbomify.com/CVE-2025-58034/): Fortinet FortiWeb OS Command Injection (medium 6.7, exploited in the wild)
- [CVE-2020-29015](https://insights.sbomify.com/CVE-2020-29015/): SQL injection in Fortinet FortiWeb (critical 9.8)
- [CVE-2020-29016](https://insights.sbomify.com/CVE-2020-29016/): Memory corruption in Fortinet FortiWeb (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22122 and fix it if it is affected.

What it is: CVE-2021-22122 is a medium-severity cross-site scripting vulnerability in Fortinet Fortiweb, published on 8 Feb 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-22122 exists.

Affected product: Fortinet Fortiweb. 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-2021-22122/ (Markdown: https://insights.sbomify.com/CVE-2021-22122/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22122
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22122
- OSV: https://osv.dev/vulnerability/CVE-2021-22122

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22122/
Summaries are generated and may contain mistakes; the official description above is the record.