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CVE-2020-5811 — Authenticated path traversal in UmbracoCms — CVE...

MEDIUM

Authenticated path traversal in Umbraco CMS

Published April 13, 2021Updated September 10, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published April 13, 2021 (2008 days ago).
  • Last revised September 10, 2026 — 1975 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update UmbracoCms to 8.9.2 or later
dotnet add package UmbracoCms --version 8.9.2

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
UmbracoCms
nuget
4.10.0, 4.10.0-beta, 4.10.0-rc, 4.10.1 (+261 more)8.9.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 6.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

Frequently Asked Questions

What is CVE-2020-5811?
Authenticated path traversal in Umbraco CMS This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 6.5/10).
How do I check if my project is affected by CVE-2020-5811?
CVE-2020-5811 affects UmbracoCms. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2020-5811 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
6.5

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-936x-wgqv-hhgq

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