4.9

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-66625

CVE-2025-66625: Umbraco Vulnerable to Improper File Access and Credential Exposure through Dictionary Import Functionality

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.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-66625

CVE-2025-66625:

4.9

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
Umbraco.Cms	nuget	>= 10.0.0, <= 13.12.0	13.12.1

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in two separate controllers, ContentTypeController and DictionaryController, both of which have import functionalities that handle file paths insecurely. The methods Import and ImportDictionary respectively, took a user-provided file path and used it to check for a file's existence on the server. The application's response differed based on whether the file existed or not, creating a file enumeration oracle. An attacker with backoffice access could exploit this to map out the server's file system. The patch addresses this by ensuring that the user input is treated as a filename only, and not a path, by stripping any path-related characters and combining it with a fixed, trusted base directory. This prevents the path traversal and subsequent file enumeration.

Vulnerable functions

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Vulnerability Intelligence
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WAF Protection Rules

WAF Rule

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Reasoning

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