Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads
Impact
Via a manipulated API request it's possible to upload a file that doesn't adhere with the configured allowable file extensions.
Patches
Patched in 15.4.2 and 16.0.0.
Workarounds
None available.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Umbraco.Cms | >= 14.0.0, < 15.4.2 | 15.4.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L- Weakness (CWE)
CWE-434- Platform
- .NET (NuGet)
- Package
Umbraco.Cms- Disclosed
- 04.06.2025
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-fr6r-p8hv-x3c4 - 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 Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads this entry
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