CVE-2026-40321 HIGH

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

Vendor Dnnsoftware
Product Dnn.Platform
Weakness CWE-87
Published April 17, 2026
Last update April 22, 2026
View on NVD All CVEs

CVSS base score

8.1/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 17, 2026 CVE published
April 22, 2026 Record updated