CVE-2025-48953

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

Published: Jun 3, 2025Updated: Sep 22, 2025 Sources: CVE List NVD GHSACWE-434

5.5MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:LPrivileges Required

Low

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:LAvailability

Low

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Weaknesses

CWE-434

Affected Products

umbraco

commercial·DKaka umbraco forms, umbraco cms, umbraco-cms

umbraco cmsOn-premCMS Plugin

Web & CMS Plugins / cms-core

Umbraco-CMSOn-premCMS Plugin

Web & CMS Plugins / cms-core

NuGet

package-ecosystem

Umbraco.Cms

OSS Libraries

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

3 techniques

Command and Control

Initial Access

Persistence

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References

https://github.com/umbraco/Umbraco-CMS/commit/d920e93d1ee29dc3301697e444f53e8cd5db3cf9

github.com

https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-fr6r-p8hv-x3c4

github.com

https://nvd.nist.gov/vuln/detail/CVE-2025-48953

nvd.nist.gov

and 1 more references View all →

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