CVE-2020-5811

Name: CVE-2020-5811
Creator: NVD / NIST
Published: 2020-12-30T16:15:12.447+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 9.37%

Last modified Jun 17, 2026

CVE-2020-5811 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 9.37% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

9.37%

94.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Umbraco	Umbraco Cms	<= 8.9.1

References

http://packetstormsecurity.com/files/163965/Umbraco-CMS-8.9.1-Traversal-Arbitrary-File-Write.htmlExploit, Third Party Advisory, VDB Entry
https://www.tenable.com/security/research/tra-2020-59Exploit, Third Party Advisory
http://packetstormsecurity.com/files/163965/Umbraco-CMS-8.9.1-Traversal-Arbitrary-File-Write.htmlExploit, Third Party Advisory, VDB Entry
https://www.tenable.com/security/research/tra-2020-59Exploit, Third Party Advisory

Timeline

Published: Dec 30, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5811?

How severe is CVE-2020-5811?

CVE-2020-5811 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 9.37% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5811?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-5811?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST