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Vulnerability record · CVE-2020-5811 · published 30 December 2020

CVE-2020-5811: Umbraco cms path traversal vulnerability

Umbraco · 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.

6.5 CVSS 3.1 Medium EPSS 9.5% · top 4.7% CWE-22 · Path traversal
6.5CVSS 3.1 base score, v2 4.0
9.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/163965/Umbraco-CMS-8.9.1-Traversal-Arbitrary-File-Write.html ExploitThird Party AdvisoryVDB Entry
https://www.tenable.com/security/research/tra-2020-59 ExploitThird Party Advisory
http://packetstormsecurity.com/files/163965/Umbraco-CMS-8.9.1-Traversal-Arbitrary-File-Write.html ExploitThird Party AdvisoryVDB Entry
https://www.tenable.com/security/research/tra-2020-59 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-5811), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.