CVE-2020-9471

HIGHNVD 8.88.8—

8.8

Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 86.6%
KEV: Not listed

Published

March 16, 2020

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://gitlab.com/eLeN3Re/cve-2020-9471
af854a3a-2127-422b-91ae-364da2661108https://gitlab.com/eLeN3Re/cve-2020-9471

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
nuget	UmbracoCMS.Core	—	ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)

NuGet(1)

Package	Vulnerable range	Fixed in	Dependents
UmbracoCMS.Core	4.10.0 ... 8.5.3 (238 versions)	—	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-434Unrestricted Upload of File with Dangerous Type

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 06:21 UTCEG score recompute
2026-05-27 06:21 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2020-9471?

CVE-2020-9471 is a high vulnerability published on March 16, 2020. Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.

When was CVE-2020-9471 disclosed?

CVE-2020-9471 was first published in the National Vulnerability Database on March 16, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-9471 actively exploited?

CVE-2020-9471 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 86.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-9471?

CVE-2020-9471 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2020-9471?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-9471, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-9471

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Is Your Infrastructure Affected by CVE-2020-9471?

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