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CVE-2025-48953 — Vulnerability in Umbraco.Cms — CVE Details

MEDIUM

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

Published June 4, 2025Updated June 5, 2025Source: osv

Summary

### Impact Via a manipulated API request it's possible to upload a file that doesn't adhere with the configured allowable file extensions. ### Patches Patched in 15.4.2 and 16.0.0. ### Workarounds None available.

Advisory Timeline

  • First published June 4, 2025 (494 days ago).
  • Last revised June 5, 2025 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update Umbraco.Cms to 15.4.2 or later
dotnet add package Umbraco.Cms --version 15.4.2

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
Umbraco.Cms
nuget
14.0.0, 14.1.0, 14.1.0-rc, 14.1.0-rc2 (+35 more)15.4.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-434
    Unrestricted File UploadMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L

References

Frequently Asked Questions

What is CVE-2025-48953?
Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.5/10).
How do I check if my project is affected by CVE-2025-48953?
CVE-2025-48953 affects Umbraco.Cms. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-48953 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
5.5

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-fr6r-p8hv-x3c4

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