CVE-2020-5811
Authenticated path traversal in Umbraco CMS
An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.
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
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.
- Record
CVE-2020-5811- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:N/I:P/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
CVE List No score
An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.
- Record
CVE-2020-5811- Updated
- 2026-11-02
EUVDEUVD-2021-0802 No score
An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.
- Record
EUVD-2021-0802- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-936x-wgqv-hhgq
Authenticated path traversal in Umbraco CMS
An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.
- Record
GHSA-936x-wgqv-hhgq- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
OSV
An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.
- Record
CVE-2020-5811- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-936x-wgqv-hhgq
Authenticated path traversal in Umbraco CMS
An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.
- Record
GHSA-936x-wgqv-hhgq- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
UmbracoCmsNuGet |
before 8.9.2 | 8.9.2 |
UmbracoCmsNuGet |
before 8.9.2, plus listed versions 4.10.04.10.0-beta4.10.0-rc4.10.14.10.1.1 Show 45 moreShow less4.11.04.11.14.11.104.11.24.11.2.14.11.2.24.11.2.34.11.34.11.3.14.11.44.11.54.11.64.11.74.11.84.11.94.7.24.8.04.8.0-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-RC |
8.9.2 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Umbraco CMS 8.9.1 - Directory Traversal | 2021-08-31 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, products | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-5811 is a medium vulnerability (CVSS 6.5) in Umbraco Cms, published December 30, 2020. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 9.48%, the 95th percentile. Fixed in UmbracoCms 8.9.2.
References
Left out here: 215 versions. The JSON record has them.