What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-17 · updated 2026-10-26
• Weakness: CWE-87

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.

Affected products

• DotNetNuke CMS Fixed in 9.1.1: before 10.2.2 — fixed in 10.2.2

How to fix

Upgrade to a fixed version: DotNetNuke CMS Fixed in 9.1.1 10.2.2. Check the vendor advisory for mitigations.

References

• https://github.com/dnnsoftware/Dnn.Platform/releases/tag/v10.2.2
• https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-ffq7-898w-9jc4

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