CVE-2026-40321 — Vulnerability in DotNetNuke.Core — CVE Details

HIGH

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

Published April 10, 2026Updated May 5, 2026Source: osv

Summary

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.

Advisory Timeline

First published April 10, 2026 (185 days ago).
Last revised May 5, 2026 — 25 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet

Update DotNetNuke.Core to 10.2.2 or later

dotnet add package DotNetNuke.Core --version 10.2.2

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: nuget (1).

Package	Ecosystem	Affected	Fixed In
DotNetNuke.Core	nuget	10.0.0, 10.0.1, 10.1.0, 10.1.1 (+62 more)	10.2.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-87
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.0 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

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

References

Frequently Asked Questions

What is CVE-2026-40321?: DotNetNuke.Core has stored cross-site-scripting (XSS) via SVG upload This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.0/10).
How do I check if my project is affected by CVE-2026-40321?: CVE-2026-40321 affects DotNetNuke.Core. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-40321 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

8.0

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-ffq7-898w-9jc4

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