CVE-2026-40321: Dnnsoftware DotNetNuke

High severity, CVSS 8.0. EPSS: 0.4% chance of exploitation in the next 30 days.

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.2.2, a user could upload a specially crafted SVG file that could include scripts that can target both authenticated and unauthenticated DNN users. The impact is increased if the scripts are run by a power user. Version 10.2.2 patches the issue.

Affected products

• Dnnsoftware DotNetNuke: before 10.2.2 (fixed in 10.2.2)

Published 2026-04-17. Last modified 2026-06-17.