# CVE-2020-9472: Unrestricted Upload of File with Dangerous Type in Umbraco CMS

> Authenticated attackers can upload malicious files via the Install Package feature in Umbraco CMS, leading to remote code execution.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Mar 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-j66f-h9hm-975m

## What is CVE-2020-9472?

CVE-2020-9472 is a medium-severity vulnerability in Umbraco Umbraco Cms, published on 16 Mar 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Umbraco CMS 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Package functionality.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2020-9472?

2 open source packages ship an affected version, including UmbracoCms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `UmbracoCms` | NuGet | All versions | 8.5.4 |
| `UmbracoCms` | NuGet | All versions | 8.5.4 |

Products: Umbraco Umbraco Cms.

## How do I fix CVE-2020-9472?

Upgrade UmbracoCms to 8.5.4 or later.

## Is CVE-2020-9472 being exploited?

There is no known exploitation of CVE-2020-9472 in the wild and no public exploit code.

## Other vulnerabilities in Umbraco Umbraco Cms

- [CVE-2025-67288](https://insights.sbomify.com/CVE-2025-67288/): Umbraco CMS has an arbitrary file upload vulnerability (critical 10.0)
- [CVE-2014-10074](https://insights.sbomify.com/CVE-2014-10074/): File upload in n/a (critical 9.8)
- [CVE-2012-1301](https://insights.sbomify.com/CVE-2012-1301/): Server-side request forgery in n/a (critical 9.8)
- [CVE-2012-10054](https://insights.sbomify.com/CVE-2012-10054/): Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE (critical 9.3)
- [CVE-2025-32017](https://insights.sbomify.com/CVE-2025-32017/): Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-9472 and fix it if it is affected.

What it is: CVE-2020-9472 is a medium-severity vulnerability in Umbraco Umbraco Cms, published on 16 Mar 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-9472 in the wild and no public exploit code.

Affected packages and fixed versions:
- UmbracoCms (NuGet): affected all versions; fixed in 8.5.4
- UmbracoCms (NuGet): affected all versions; fixed in 8.5.4

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-2020-9472/ (Markdown: https://insights.sbomify.com/CVE-2020-9472/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-9472
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-9472
- OSV: https://osv.dev/vulnerability/CVE-2020-9472

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-9472/
Summaries are generated and may contain mistakes; the official description above is the record.