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CVE-2025-66625

Umbraco Vulnerable to Improper File Access and Credential Exposure through Dictionary Import Functionality

Published: Dec 9, 2025Updated: Jan 2, 2026 Sources: CVE List NVD GHSACWE-200
NVD MITRE
4.9CVSSMEDIUM
EPSS Score
0.3%
Top 78.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Umbraco is an ASP.NET CMS. Due to unsafe handling and deletion of temporary files in versions 10.0.0 through 13.12.0, during the dictionary upload process an attacker with access to the backoffice can trigger predictable requests to temporary file paths. The application’s error responses (HTTP 500 when a file exists, 404 when it does not) allow the attacker to enumerate the existence of arbitrary files on the server’s filesystem. This vulnerability does not allow reading or writing file contents. In certain configurations, incomplete clean-up of temporary upload files may additionally expose the NTLM hash of the Windows account running the Umbraco application. This issue is fixed in version 13.12.1.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-200CWE-377CWE-552

Affected Products

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

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://github.com/umbraco/Umbraco-CMS/commit/7505efd433189037f46547932d4a8b603fd4a615
github.com
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-hfv2-pf68-m33x
github.com
https://nvd.nist.gov/vuln/detail/CVE-2025-66625
nvd.nist.gov
and 1 more references View all →

Timeline

Published
Dec 9, 2025
Last Updated
Jan 2, 2026

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