5.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2020-5186

CVE-2020-5186: DNN XSS Vulnerability

DNN (formerly DotNetNuke) through 9.4.4 allows XSS (issue 1 of 2).

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2020-5186

CVE-2020-5186:

5.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
DotNetNuke.Core	nuget	<= 9.4.4

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from improper input sanitization in XML file processing within the journal module. The blog post demonstrates XSS via XML files using XHTML namespace declarations containing <script> tags. The JournalController.SaveJournalItem is the logical entry point for handling user-generated journal content, including XML uploads. While exact code isn't available, DNN's architecture patterns and the described attack vector strongly implicate this core journal processing function. The high confidence comes from: 1) Clear attack vector description requiring XML processing in journals 2) DNN's module structure 3) CWE-79 alignment with unsanitized input in content rendering workflows.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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