CVE-2025-48953: Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads

CVE-2025-48953 · Severity: low · CVSS 3.1 · Published 2025-06-04

Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads

Technologies: Umbraco.Cms (NuGet). Vendors: NuGet.

Quick answers

Is CVE-2025-48953 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-48953 being exploited in the wild.
How severe is CVE-2025-48953?
Low severity, with a CVSS score of 3.1, published 4 June 2025.
Which products and versions are affected?
Umbraco.Cms (NuGet) ECOSYSTEM:introduced=14.0.0,fixed=15.4.2.
Is there a fix for CVE-2025-48953?
Yes. Umbraco.Cms (NuGet): upgrade to 15.4.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-48953?
Check whether you run Umbraco.Cms (NuGet) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Umbraco.Cms (NuGet): upgrade to 15.4.2 or later
    dotnet add package Umbraco.Cms --version 15.4.2

Affected products

  • Umbraco.Cms (NuGet) ECOSYSTEM:introduced=14.0.0,fixed=15.4.2

Identifiers

  • CVE-2025-48953
  • GHSA-fr6r-p8hv-x3c4

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