Privilege Escalation using Spoofing
Impact
Users with low privileges ( Editor, etc) are able to access some unintended endpoints.
Explanation of the vulnerability
Possible to delete redirect urls, when disabled by admin with only access to backoffice Possible to access the examine dashboard with only access to backoffice Possible to access the published cache dashboard with only access to backoffice Possible to access the telemetry dashboard with only access to backoffice Possible to access the languages with only access to backoffice Possible to access the stylesheets with only access to backoffice
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Umbraco.CMS | >= 8.0.0, < 8.18.10, >= 9.0.0, < 10.8.1, >= 11.0.0, < 12.3.4 | 8.18.10, 10.8.1, 12.3.4 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-863- Platform
- .NET (NuGet)
- Package
Umbraco.CMS- Disclosed
- 13.12.2023
- Updated
- 11.10.2026 11:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-cfr5-7p54-4qg8 - CC BY 4.0
Vulnerability history: Umbraco.CMS
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 29
- First → latest
- 05.2022 09.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 17
- Low 7
Disclosures per year
- 2022: 2
- 2023: 8
- 2024: 5
- 2025: 8
- 2026: 6
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