# CVE-2020-21053: Cross-site scripting in n/a

> Remote attackers can inject arbitrary scripts via the query_string parameter in FusionPBX, potentially leading to session hijacking or malicious actions.

- **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:** 20 May 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-w9pj-vvhp-w8m8

## What is CVE-2020-21053?

CVE-2020-21053 is a medium-severity cross-site scripting vulnerability in Fusionpbx Fusionpbx, published on 20 May 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

Cross Site Scriptiong (XSS) vulnerability exists in FusionPBX 4.5.7 allows remote malicious users to inject arbitrary web script or HTML via an unsanitized "query_string" variable in app\devices\device_imports.php.

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

## Which versions are affected by CVE-2020-21053?

It affects 1 product.


Products: Fusionpbx Fusionpbx.

## How do I fix CVE-2020-21053?

No fix has been published for CVE-2020-21053 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-21053 being exploited?

There is no known exploitation of CVE-2020-21053 in the wild and no public exploit code.

## Other vulnerabilities in Fusionpbx Fusionpbx

- [CVE-2022-35153](https://insights.sbomify.com/CVE-2022-35153/): Command injection in n/a (critical 9.8)
- [CVE-2022-28055](https://insights.sbomify.com/CVE-2022-28055/): Command injection in n/a (critical 9.8)
- [CVE-2021-43404](https://insights.sbomify.com/CVE-2021-43404/): Path traversal in n/a (high 8.8)
- [CVE-2021-43405](https://insights.sbomify.com/CVE-2021-43405/): Command injection in n/a (high 8.8)
- [CVE-2021-43406](https://insights.sbomify.com/CVE-2021-43406/): Other in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-21053 and fix it if it is affected.

What it is: CVE-2020-21053 is a medium-severity cross-site scripting vulnerability in Fusionpbx Fusionpbx, published on 20 May 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: There is no known exploitation of CVE-2020-21053 in the wild and no public exploit code.

Affected product: Fusionpbx Fusionpbx. 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-2020-21053/ (Markdown: https://insights.sbomify.com/CVE-2020-21053/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-21053
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-21053
- OSV: https://osv.dev/vulnerability/CVE-2020-21053

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-21053/
Summaries are generated and may contain mistakes; the official description above is the record.