Medium severity · published Dec 9, 2025
CVE-2025-66625
Umbraco Vulnerable to Improper File Access and Credential Exposure through Dictionary Import Functionality
4.9
CVSS
0.4%
EPSS
No
On KEV
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
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UM
Umbraco-CMS · umbraco
10.0.0, < 13.12.1 · source: vendor
UC
Umbraco Cms · Umbraco
10.0.0 before 13.12.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66625
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66625
Patch
https://github.com/umbraco/Umbraco-CMS/commit/7505efd433189037f46547932d4a8b603fd4a615
Patch
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-hfv2-pf68-m33x
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