CVE-2025-48953

Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads

Description

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 API request. The issue is patched in versions 15.4.2 and 16.0.0. No known workarounds are available.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Affected: umbraco Umbraco-CMS
Published at:
Updated at:

References

Link Tags
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-fr6r-p8hv-x3c4
https://github.com/umbraco/Umbraco-CMS/commit/d920e93d1ee29dc3301697e444f53e8cd5db3cf9

Frequently Asked Questions

What is the severity of CVE-2025-48953?
CVE-2025-48953 has been scored as a medium severity vulnerability.
How to fix CVE-2025-48953?
To fix CVE-2025-48953, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-48953 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-48953 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-48953?
CVE-2025-48953 affects umbraco Umbraco-CMS.
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