CVE-2023-49273: Umbraco CMS

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, users with low privileges (Editor, etc.) are able to access some unintended endpoints. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.

Affected products

• Umbraco Umbraco CMS: from 8.0.0, before 8.18.10 (fixed in 8.18.10); from 10.0.0, before 10.8.1 (fixed in 10.8.1); from 12.0.0, before 12.3.4 (fixed in 12.3.4)

Published 2023-12-12. Last modified 2026-06-17.