CVE-2026-40321: DotNetNuke.Core has stored cross-site-scripting (XSS) via SVG upload

Executive brief

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

• NuGet DotNetNuke.Core

References

• https://api.github.com/users/bdukes
• https://github.com/bdukes
• https://api.github.com/users/bdukes/gists%7B/gist_id%7D
• https://api.github.com/users/bdukes/repos
• https://avatars.githubusercontent.com/u/59507?v=4
• https://api.github.com/users/bdukes/events%7B/privacy%7D