CVE-2020-5811

MEDIUM

Umbraco CMS <=8.9.1 - Path Traversal

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2020-5811. PoCs published by BitTheByte.

AI-analyzed exploit summary This exploit leverages an authenticated path traversal vulnerability in Umbraco CMS to create a malicious package that can write arbitrary files to the server. It generates a ZIP file containing a shell payload and a crafted XML manifest to facilitate the attack.

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.

Exploits (1)

exploitdb WORKING POC
by BitTheByte · pythonwebappsaspx
https://www.exploit-db.com/exploits/50241

This exploit leverages an authenticated path traversal vulnerability in Umbraco CMS to create a malicious package that can write arbitrary files to the server. It generates a ZIP file containing a shell payload and a crafted XML manifest to facilitate the attack.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Umbraco CMS <= 8.9.1
Auth required
Prerequisites: Authenticated access to Umbraco CMS · Ability to upload packages
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2
Core References
Exploit, Third Party Advisory x_refsource_misc
https://www.tenable.com/security/research/tra-2020-59

Scores

CVSS v3 6.5
EPSS 0.0261
EPSS Percentile 86.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Details

CWE
CWE-22
Status published
Products (2)
nuget/UmbracoCms 0 - 8.9.2NuGet
umbraco/umbraco_cms < 8.9.1
Published Dec 30, 2020
Tracked Since Feb 18, 2026