CVE-2018-17256: Umbraco CMS

Medium severity, CVSS 4.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Persistent cross-site scripting (XSS) vulnerability in Umbraco CMS 7.12.3 allows authenticated users to inject arbitrary web script via the Header Name of a content (Blog, Content Page, etc.). The vulnerability is exploited when updating or removing public access of a content.

Affected products

• Umbraco Umbraco CMS: version 7.12.3 only

Published 2018-11-27. Last modified 2026-06-17.