Information Exposure Through an Error Message in Umbraco CMS - CVE-2025-66625
Published: December 9, 2025
Vulnerability identifier: #VU119398
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-66625
CWE-ID: CWE-209
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Umbraco
Affected software:
Umbraco CMS
Umbraco CMS
Detailed vulnerability description
The vulnerability allows a remote user to gain access to sensitive information.
The vulnerability exists due to unsafe handling and deletion of temporary files during the dictionary upload process. A remote user can enumerate existing files on the system and under certain circumstances obtain the NTLM hash of the Windows account running the Umbraco application.
How to mitigate CVE-2025-66625
Install updates from vendor's website.