UmbracoCms Known Vulnerabilities & Fixes
UmbracoCms has 4 known security vulnerabilities in NuGet (.NET). Upgrade to version 8.18.15 or later to resolve all known issues. Data sourced from OSV, enriched with EPSS exploit probability and CISA KEV.
Low Immediate Risk
No actively exploited vulnerabilities detected. Monitor and update in your next maintenance window.
Recommended safe version: 8.18.15
Upgrading to 8.18.15 or later resolves all 4 known vulnerabilities in UmbracoCms. Run: dotnet add package UmbracoCms --version 8.18.15
Is UmbracoCms in your project?
Check if you're affected and upgrade to 8.18.15 to stay secure.
Security Summary
- 3 affected version ranges have been identified across these 4 advisories.
- 75% of known issues have a published fixed version.
- Remediation: dotnet add package UmbracoCms
Vulnerabilities
4 unique vulnerabilities — sorted by exploitation risk (KEV → EPSS → CVSS). Click a CVE/GHSA ID for full details. First disclosed Apr 13, 2021, most recently Jan 15, 2026 (1738 days apart).
| CVE / GHSA | Severity | Affected | Fixed In |
|---|---|---|---|
| CVE-2021-47776 Umbraco CMS contains a server-side request forgery vulnerability | MEDIUM | 8.14.1 | No fix available |
| CVE-2020-5811 Authenticated path traversal in Umbraco CMS | MEDIUM | 4.10.0, 4.10.0-beta, 4.10.0-rc, 4.10.1 (+261 more) | 8.9.2 |
| CVE-2020-9472 Unrestricted Upload of File with Dangerous Type in Umbraco CMS | MEDIUM | 4.10.0, 4.10.0-beta, 4.10.0-rc, 4.10.1 (+235 more) | 8.5.4 |
| CVE-2024-48927 Umbraco has a Potential Code Execution Risk When Viewing SVG Files in Full Screen in Backoffice | MEDIUM | 8.0.0, 8.0.1, 8.0.2, 8.0.3 (+103 more) | 8.18.15 |
About This Data
Vulnerability data for UmbracoCms is sourced from the Open Source Vulnerability (OSV) database, aggregating reports from GitHub Advisory Database, NIST NVD, and ecosystem-specific sources.
CVSS (Common Vulnerability Scoring System) scores reflect exploitability and impact. EPSS (Exploit Prediction Scoring System) scores indicate the probability of exploitation within the next 30 days. Vulnerabilities marked with are listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
Related NuGet (.NET) Packages
Other packages in this ecosystem, ranked by shared vulnerabilities where available.
Check Your Dependencies
Scan your project to check if you're using a vulnerable version of UmbracoCms.