Moderate severityNVD Advisory· Published Jun 3, 2025· Updated Jun 3, 2025
Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads
CVE-2025-48953
Description
Umbraco is an ASP.NET content management system (CMS). Starting in version 14.0.0 and prior to versions 15.4.2 and 16.0.0, it's possible to upload a file that doesn't adhere with the configured allowable file extensions via a manipulated API request. The issue is patched in versions 15.4.2 and 16.0.0. No known workarounds are available.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
Umbraco.CmsNuGet | >= 14.0.0, < 15.4.2 | 15.4.2 |
Affected products
2- Range: >= 14.0.0, < 15.4.2
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-fr6r-p8hv-x3c4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-48953ghsaADVISORY
- github.com/umbraco/Umbraco-CMS/commit/d920e93d1ee29dc3301697e444f53e8cd5db3cf9ghsax_refsource_MISCWEB
- github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-fr6r-p8hv-x3c4ghsax_refsource_CONFIRMWEB
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