Vulnerability · Published Jun 3, 2025 · Assigned by GitHub_M
CVE-2025-48953Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads
Medium 5.5
In plain English
A medium-severity unrestricted file upload in Umbraco-CMS from umbraco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| NuGet | umbraco.cms | 15.4.2 | GHSA-fr6r-p8hv-x3c4 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| umbraco | Umbraco-CMS | >= 14.0.0, < 15.4.2 |
Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L