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

Published Apr 10, 2026
·
Updated

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.

Affected Software

2 affected componentsFixes available
nuget/DotNetNuke.Core<10.2.2
10.2.2
dnnsoftware Dotnetnuke<10.2.2

Event History

Apr 10, 2026
Advisory Published
via GitHub·08:42 PM
Data Sourced
via GitHub·08:42 PM
DescriptionSeverityWeaknessAffected Software
Apr 17, 2026
CVE Published
via MITRE·09:10 PM
Data Sourced
via MITRE·09:10 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·10:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-40321?

CVE-2026-40321 is considered a high severity vulnerability due to the potential for stored cross-site scripting (XSS) attacks.

2

How do I fix CVE-2026-40321?

To fix CVE-2026-40321, upgrade DotNetNuke.Core to version 10.2.2 or later.

3

Who is affected by CVE-2026-40321?

CVE-2026-40321 affects all users of DotNetNuke versions prior to 10.2.2, including both authenticated and unauthenticated users.

4

What type of vulnerability is CVE-2026-40321?

CVE-2026-40321 is classified as a stored cross-site scripting (XSS) vulnerability.

5

What could an attacker achieve with CVE-2026-40321?

An attacker could exploit CVE-2026-40321 to execute malicious scripts on the browsers of users interacting with a compromised SVG file.

Company

Resources

Contact

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