What is CVE-2025-48953?

CVE-2025-48953 is a medium-severity vulnerability in Umbraco Umbraco-cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.5/10. Published 2025-06-03.

How severe is CVE-2025-48953?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Arbitrary file upload in Umbraco Umbraco-cms

CVE-2025-48953

Umbraco is an ASP.NET content management system (CMS). Starting in version 14.0.0 and prior to versions 15.4.2 and 16.0.0, it's possible to upload a file that doesn't adhere with the configured allowable file extensions via a manipulated A…

Vulnerability class: Unrestricted File Upload

EPSS: 0.002 (40.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L.

Affected products

Umbraco Umbraco-cms — versions >= 14.0.0, < 15.4.2

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-fr6r-p8hv-x3c4 (x_refsource_CONFIRM)
https://github.com/umbraco/Umbraco-CMS/commit/d920e93d1ee29dc3301697e444f53e8cd5db3cf9 (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-48953?: CVE-2025-48953 is a medium-severity vulnerability in Umbraco Umbraco-cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.5/10. Published 2025-06-03.
How severe is CVE-2025-48953?: Medium severity. CVSS v3 base score is 5.5 out of 10.