# CVE-2020-36905: FIBARO System Home Center 5.021 Remote File Inclusion via Proxy API

> Attackers can inject malicious JavaScript via the proxy API to hijack user sessions or manipulate page content in FIBARO Home Center devices.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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:** 6 Jan 2026
- **Updated:** 5 Mar 2026
- **Also known as:** GHSA-433h-wv4r-9p9x

## What is CVE-2020-36905?

CVE-2020-36905 is a medium-severity cross-site scripting vulnerability in FIBAR GROUP S.A. Home Center 2, published on 6 Jan 2026. 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

FIBARO System Home Center 5.021 contains a remote file inclusion vulnerability in the undocumented proxy API that allows attackers to include arbitrary client-side scripts. Attackers can exploit the 'url' GET parameter to inject malicious JavaScript and potentially hijack user sessions or manipulate page content.

Weakness: CWE-829 (Inclusion of Functionality from Untrusted Control Sphere)

## Which versions are affected by CVE-2020-36905?


## How do I fix CVE-2020-36905?

No fix has been published for CVE-2020-36905 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-36905 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-36905 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-36905 and fix it if it is affected.

What it is: CVE-2020-36905 is a medium-severity cross-site scripting vulnerability in FIBAR GROUP S.A. Home Center 2, published on 6 Jan 2026. 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-2020-36905 exists.

Affected product: FIBAR GROUP S.A. Home Center 2. 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-2020-36905/ (Markdown: https://insights.sbomify.com/CVE-2020-36905/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-36905
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-36905
- OSV: https://osv.dev/vulnerability/CVE-2020-36905

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-36905/
Summaries are generated and may contain mistakes; the official description above is the record.