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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
NVD MITRE
5.5CVSSMEDIUM
EPSS Score
0.2%
Top 95.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:RS:CC:LI:LA:L
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
Open in CVSS calculator →

Weaknesses

CWE-434

Affected Products

umbraco cmsumbraco
On-premCMS Plugin
Web & CMS Plugins / cms-core
Umbraco.CmsNuGetOSS Libraries
Umbraco-CMSumbraco
On-premCMS Plugin
Web & CMS Plugins / cms-core
umbracocommercialDKWeb & CMS Pluginsaka umbraco cms, umbraco forms, umbraco-cms
nugetpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques
Command and Control
Initial Access
Persistence
View detailed technique mapping

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 →

Timeline

Published
Jun 3, 2025
Last Updated
Sep 22, 2025

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