CVE-2025-27601: Umbraco CMS

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Umbraco is a free and open source .NET content management system. An improper API access control issue has been identified Umbraco's API management package prior to versions 15.2.3 and 14.3.3, allowing low-privilege, authenticated users to create and update data type information that should be restricted to users with access to the settings section. The issue is patched in versions 15.2.3 and 14.3.3. No known workarounds are available.

Affected products

• Umbraco Umbraco CMS: before 14.3.3 (fixed in 14.3.3); from 15.0.0, before 15.2.3 (fixed in 15.2.3)

Published 2025-03-11. Last modified 2026-06-17.