Vulnerability DatabaseCVE-2025-48953

CVE-2025-48953:
C# vulnerability analysis and mitigation

Overview

CVE-2025-48953 is a security vulnerability discovered in Umbraco, an ASP.NET content management system (CMS). The vulnerability affects versions starting from 14.0.0 and prior to versions 15.4.2 and 16.0.0. The issue was disclosed on June 3, 2025, and allows attackers to upload files that bypass the configured allowable file extensions through manipulated API requests (GitHub Advisory).

Technical details

The vulnerability has been assigned a CVSS v3.1 base score of 5.5 (Medium) with the vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L. This indicates that the vulnerability requires network access, has high attack complexity, requires low privileges, and needs user interaction. The vulnerability is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type) (NVD).

Impact

The vulnerability allows attackers to bypass file extension restrictions in Umbraco CMS, potentially enabling the upload of dangerous file types. This could lead to low-level impacts on confidentiality, integrity, and availability of the system (GitHub Advisory).

Mitigation and workarounds

The vulnerability has been patched in Umbraco versions 15.4.2 and 16.0.0. Users are advised to upgrade to these patched versions as no known workarounds are available (GitHub Advisory).

Additional resources

Source: This report was generated using AI

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