What’s Vulnerable › Vulnerabilities

CVE-2020-5811

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 9.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-12-30 · updated 2026-06-17
• Weakness: CWE-22

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.

Affected products

• Umbraco-CMS: through 8.9.1

References

• http://packetstormsecurity.com/files/163965/Umbraco-CMS-8.9.1-Traversal-Arbitrary-File-Write.html
• 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.tenable.com/security/research/tra-2020-59

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