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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Advisories
Source ID Title
EUVD EUVD EUVD-2025-16778 Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads
Github GHSA Github GHSA GHSA-fr6r-p8hv-x3c4 Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 22 Sep 2025 16:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*

Tue, 03 Jun 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 03 Jun 2025 18:30:00 +0000

Type Values Removed Values Added
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.
Title Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads
Weaknesses CWE-434
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-06-03T18:31:44.345Z

Reserved: 2025-05-28T18:49:07.585Z

Link: CVE-2025-48953

cve-icon Vulnrichment

Updated: 2025-06-03T18:31:34.794Z

cve-icon NVD

Status : Analyzed

Published: 2025-06-03T19:15:39.423

Modified: 2025-09-22T13:54:31.090

Link: CVE-2025-48953

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-06-24T09:44:17Z

Weaknesses