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CVE-2026-40306— DNN has same HostGUID for all new installs

Quick assessment

Affected
dnnsoftware Dnn.Platform
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DNN（又名DotNetNuke）是美国DNN公司的一套由微软支持、基于ASP.NET平台的开源内容管理系统（CMS）。该系统具有易于安装、可扩展、功能丰富等特点。 DNN 10.x.x至10.2.1版本存在安全漏洞，该漏洞源于新安装实例具有相同的主机GUID，可能导致安全问题。

AI Predicted 2.3 Difficulty: Theoretical EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1136 · Create Account
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I. Basic Information for CVE-2026-40306

Vulnerability Information
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Vulnerability Title
DNN has same HostGUID for all new installs
Source: CVE Program / CVE List V5
Vulnerability Description
DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. All new installations of DNN 10.x.x - 10.2.1 have the same Host GUID. This does not affect upgrades from 9.x.x. Version 10.2.2 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不充分的随机数
Source: CVE Program / CVE List V5
Vulnerability Title
DNN 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DNN（又名DotNetNuke）是美国DNN公司的一套由微软支持、基于ASP.NET平台的开源内容管理系统（CMS）。该系统具有易于安装、可扩展、功能丰富等特点。 DNN 10.x.x至10.2.1版本存在安全漏洞，该漏洞源于新安装实例具有相同的主机GUID，可能导致安全问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
dnnsoftware Dnn.Platform >= 10.0.0, < 10.2.2 -

II. Public POCs for CVE-2026-40306

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III. Intelligence Information for CVE-2026-40306

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Same Patch Batch · dnnsoftware · 2026-04-17 · 3 CVEs total

CVE-2026-40321 8.1 HIGH DotNetNuke.Core has stored cross-site-scripting (XSS) via SVG upload
CVE-2026-40305 4.3 MEDIUM DNN has Force Friend Request Acceptance

IV. Related Vulnerabilities

Same product: Dnn.Platform
Same vendor: dnnsoftware
Same weakness: CWE-330

V. Comments for CVE-2026-40306

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