CVE-2026-40321

Name: CVE-2026-40321
Creator: NVD / NIST
Published: 2026-04-17T22:16:32.653+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8/10EPSS 7.60%

Last modified Jun 17, 2026

CVE-2026-40321 is a high-severity vulnerability rated 8/10 on the CVSS scale. 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. EPSS estimates a 7.60% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

EPSS Probability

7.60%

93.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-87

Affected Software

Vendor	Product	Versions
Dnnsoftware	Dotnetnuke	< 10.2.2

References

https://github.com/dnnsoftware/Dnn.Platform/releases/tag/v10.2.2Release Notes
https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-ffq7-898w-9jc4Vendor Advisory

Timeline

Published: Apr 17, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-40321?

How severe is CVE-2026-40321?

CVE-2026-40321 has a CVSS score of 8/10 (HIGH severity). The EPSS model estimates a 7.60% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40321?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40321?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST