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…

PriorityP335medium6.5CVSS 3.1

AVNACLPRLUIRSCCLILAL

EPSS

0.16%

5.4th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
umbraco	umbraco-cms	—	—
umbraco	umbraco_cms	>= 14.0.0 < 15.4.2	15.4.2

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.