dnnsoftware Dnn.Platform up to 10.2.1 SVG File cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k2.79

Summaryinfo

A vulnerability classified as problematic was found in dnnsoftware Dnn.Platform up to 10.2.1. This issue affects some unknown processing of the component SVG File Handler. Executing a manipulation can lead to cross site scripting. This vulnerability is registered as CVE-2026-40321. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in dnnsoftware Dnn.Platform up to 10.2.1. This vulnerability affects an unknown function of the component SVG File Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-87. The product does not neutralize or incorrectly neutralizes user-controlled input for alternate script syntax. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-40321 since 04/10/2026. The exploitation appears to be difficult. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 10.2.2 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 2.6
VulDB Temp Score: 2.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.0
CNA Vector (GitHub_M): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-87 / CWE-79 / CWE-94
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Dnn.Platform 10.2.2

Timelineinfo

04/10/2026 CVE reserved
04/17/2026 +7 days Advisory disclosed
04/17/2026 +0 days VulDB entry created
04/17/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-40321 (🔒)
GCVE (CVE): GCVE-0-2026-40321
GCVE (VulDB): GCVE-100-358120

Entryinfo

Created: 04/17/2026 23:47
Changes: 04/17/2026 23:47 (64)
Complete: 🔍
Cache ID: 216::103

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