CVE-2025-46736: Umbraco CMS

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Umbraco is a free and open source .NET content management system. Prior to versions 10.8.10 and 13.8.1, based on an analysis of the timing of post login API responses, it's possible to determine whether an account exists. The issue is patched in versions 10.8.10 and 13.8.1. No known workarounds are available.

Affected products

• Umbraco Umbraco CMS: before 10.8.10 (fixed in 10.8.10); from 10.9.0, before 13.8.1 (fixed in 13.8.1)

Published 2025-05-06. Last modified 2026-06-17.