What is CVE-2025-66625?

CVE-2025-66625 is a medium-severity vulnerability in Umbraco Umbraco-cms, classified under Information Disclosure. CVSS score: 4.9/10. Published 2025-12-09.

How severe is CVE-2025-66625?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Information disclosure in Umbraco Umbraco-cms

CVE-2025-66625

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 tempor…

Vulnerability class: Information Disclosure

EPSS: 0.000 (12.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

Affected products

Umbraco Umbraco-cms — versions 10.0.0, < 13.12.1

Weakness classification (CWE)

References

https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-hfv2-pf68-m33x (x_refsource_CONFIRM)
https://github.com/umbraco/Umbraco-CMS/commit/7505efd433189037f46547932d4a8b603fd4a615 (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-66625?: CVE-2025-66625 is a medium-severity vulnerability in Umbraco Umbraco-cms, classified under Information Disclosure. CVSS score: 4.9/10. Published 2025-12-09.
How severe is CVE-2025-66625?: Medium severity. CVSS v3 base score is 4.9 out of 10.