🛡️ CVE-2025-66625
🟡 CVSS 4.9 — Medium ✅ No Known Exploit CWE-200 NVD
4.9
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity MEDIUM
CVSS Score 4.9
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CWE CWE-200
Public Exploit âś… No
Source NVD
Published 2025-12-09
Updated 2026-06-02
Modified 2026-01-02

Affected Packages

Software From version Fixed in
umbraco-cms 10.0.0 13.12.1
umbraco.cms 10.0.0 13.12.1

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