CVE-2020-9471
Umbraco CMS Authenticated File Upload
Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.
- Record
CVE-2020-9471- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Weakness
- CWE-434
- Updated
- 2026-11-02
CVE List No score
Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.
- Record
CVE-2020-9471- Updated
- 2026-11-02
EUVDEUVD-2022-4082 No score
Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.
- Record
EUVD-2022-4082- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-h68c-4jh3-cp9j
Umbraco CMS Authenticated File Upload
Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.
- Record
GHSA-h68c-4jh3-cp9j- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
OSV
Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.
- Record
CVE-2020-9471- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-h68c-4jh3-cp9j
Umbraco CMS Authenticated File Upload
Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.
- Record
GHSA-h68c-4jh3-cp9j- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
UmbracoCMS.CoreNuGet |
through 8.5.3 | None known |
UmbracoCMS.CoreNuGet |
through 8.5.3, plus listed versions 4.10.04.10.0-beta4.10.0-rc4.10.14.11.0 Show 45 moreShow less4.11.14.11.104.11.24.11.2.14.11.2.24.11.2.34.11.34.11.3.14.11.44.11.54.11.64.11.74.11.84.11.94.7.24.8.04.8.0-beta4.8.14.9.04.9.16.0.06.0.0-RC6.0.0-beta6.0.16.0.26.0.36.0.46.0.56.0.66.0.76.0.7.16.1.06.1.0-beta6.1.0-beta-26.1.16.1.26.1.2.16.1.2.26.1.36.1.46.1.56.1.66.2.06.2.0-RC6.2.0.1-RC |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-9471 is a high vulnerability (CVSS 8.8) in Umbraco Cms, published March 16, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.28%, the 83rd percentile. No source names a fixed version.
References
Left out here: 187 versions. The JSON record has them.