CVE-2025-66625
4.9 · MEDIUMOverview
CVE-2025-66625 is a medium-severity vulnerability affecting umbraco umbraco_cms. It was published on December 9, 2025 and has a CVSS 3.1 base score of 4.9 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 4.9, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from umbraco. Update umbraco_cms to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| umbraco | umbraco_cms | >= 10.0.0, < 13.12.1 | Affected |
Frequently Asked Questions
What is CVE-2025-66625?
CVE-2025-66625 is a medium-severity vulnerability affecting umbraco umbraco_cms. It was published on December 9, 2025 and has a CVSS 3.1 base score of 4.9 (MEDIUM).
How severe is CVE-2025-66625?
This vulnerability has a CVSS 3.1 base score of 4.9, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2025-66625?
Check the references section for vendor advisories and patches from umbraco. Update umbraco_cms to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-66625?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-66625 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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