Umbraco CMS has an arbitrary file upload vulnerability
An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute arbitrary code via uploading a crafted PDF file. While Umbraco provides hooks to perform file validation, it does not do implement filtering by default. Users are expected to implement their own validation.
Note: This vulnerability is disputed by Ubraco.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Umbraco.Cms | <= 16.3.3 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-67288
- https://github.com/github/advisory-database/pull/6633
- https://docs.umbraco.com/umbraco-cms/reference/security/serverside-file-validation
- https://github.com/umbraco/Umbraco-CMS
- https://github.com/vuquyen03/CVE/tree/main/CVE-2025-67288
- http://umbraco.com
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H- Weakness (CWE)
CWE-434, CWE-79- Platform
- .NET (NuGet)
- Package
Umbraco.Cms- Disclosed
- 22.12.2025
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-54mj-vcvj-q3v5 - 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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Umbraco CMS has an arbitrary file upload vulnerability this entry
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