Exposure of Sensitive Information to an Unauthorized Actor
CVE-2025-66625
Summary
Umbraco is an ASP.NET CMS. Due to unsafe handling and deletion of temporary files in versions 10.0.0-rc1 through 13.12.0 and 13.13.0-rc, during the dictionary upload process an attacker with access to the backoffice can trigger predictable requests to temporary file paths. The applications 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 servers 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.
- LOW
- NETWORK
- NONE
- UNCHANGED
- NONE
- HIGH
- HIGH
- NONE
CWE-200 - Information Exposure
An information exposure vulnerability is categorized as an information flow (IF) weakness, which can potentially allow unauthorized access to otherwise classified information in the application, such as confidential personal information (demographics, financials, health records, etc.), business secrets, and the application's internal environment.
References
Advisory Timeline
- Published
