CVE-2020-9471 Umbraco CMS Authenticated File Upload
Authenticated attackers can upload malicious files via the Install Packages feature in Umbraco Cloud, leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-9471?
CVE-2020-9471 is a high-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 Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.
Weakness: CWE-434
Which versions are affected by CVE-2020-9471?
2 open source packages ship an affected version, including UmbracoCMS.Core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
UmbracoCMS.Core NuGet | All versions to 8.5.3 | None |
UmbracoCMS.Core NuGet | All versions to 8.5.3 | None |
Products include Umbraco Umbraco Cms.
How do I fix CVE-2020-9471?
No fix has been published for CVE-2020-9471 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-9471 being exploited?
There is no known exploitation of CVE-2020-9471 in the wild and no public exploit code.
Other vulnerabilities in Umbraco Umbraco Cms
- CVE-2025-67288 Umbraco CMS has an arbitrary file upload vulnerability
- CVE-2014-10074 File upload in n/a
- CVE-2012-1301 Server-side request forgery in n/a
- CVE-2012-10054 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE
- CVE-2025-32017 Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users
Sources
Also known as GHSA-h68c-4jh3-cp9j.