CVE-2026-40321
Stored XSS via SVG Upload in DNN CMS Before
Publication date: 2026-04-17
Last updated on: 2026-04-24
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| dnnsoftware | dotnetnuke | to 10.2.2 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-87 | The product does not neutralize or incorrectly neutralizes user-controlled input for alternate script syntax. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in DNN (formerly DotNetNuke), an open-source web content management platform. Prior to version 10.2.2, it allowed a user to upload a specially crafted SVG file containing scripts. These scripts could execute and target both authenticated and unauthenticated users of the platform.
The risk is higher if the scripts are executed by a power user, potentially leading to more severe consequences.
The issue was fixed in version 10.2.2.
How can this vulnerability impact me? :
The vulnerability can lead to the execution of malicious scripts on the DNN platform, which can compromise the confidentiality, integrity, and availability of the system.
Since the scripts can target both authenticated and unauthenticated users, attackers might gain unauthorized access or perform actions with elevated privileges, especially if a power user is affected.
This can result in data breaches, unauthorized modifications, or denial of service.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade your DNN (DotNetNuke) installation to version 10.2.2 or later, as this version patches the issue.