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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
5.5MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 94.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not 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.

No summary for this CVE yet.

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
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

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

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 →

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