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

Quick answers

Is CVE-2026-40321 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-40321 being exploited in the wild.

How severe is CVE-2026-40321?

High severity, with a CVSS score of 8, published 17 April 2026.

Which products and versions are affected?

DotNetNuke.Core (NuGet) < 10.2.2, ECOSYSTEM:introduced=0,fixed=10.2.2.

Is there a fix for CVE-2026-40321?

Yes. DotNetNuke.Core (NuGet): upgrade to 10.2.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Am I affected by CVE-2026-40321?

Check whether you run Dnnsoftware Dotnetnuke or DotNetNuke.Core (NuGet) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

• DotNetNuke.Core (NuGet): upgrade to 10.2.2 or later

  dotnet add package DotNetNuke.Core --version 10.2.2

Affected products

• Dnnsoftware Dotnetnuke
• DotNetNuke.Core (NuGet) < 10.2.2, ECOSYSTEM:introduced=0,fixed=10.2.2

Identifiers

• CVE-2026-40321
• GHSA-ffq7-898w-9jc4

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