Vulnerability · Published Apr 17, 2026 · Assigned by GitHub_M

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

High 8.1

In plain English

A high-severity security flaw in Dnn.Platform from dnnsoftware. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 6.4% (higher than 94% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)6.4%top 6.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
NuGet	dotnetnuke.core	10.2.2	GHSA-ffq7-898w-9jc4

Affected products (as reported)

Vendor	Product	Versions
dnnsoftware	Dnn.Platform	< 10.2.2

Weakness: CWE-87 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

References

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