CVE-2026-40306: medium-severity vulnerability in dnnsoftware Dnn.Platform
DNN has same HostGUID for all new installs
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.9epss 0.2%
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.
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
Affected products
dnnsoftware · Dnn.PlatformRelated CVEs — dnnsoftware Dnn.Platform
In the same product, most dangerous first.
CVE-2025-64095CRITICALDNN Insufficient Access Control - Image Upload allows for Site Content OverwriteEPSS 47.0%CVE-2025-52488HIGHDNN.PLATFORM leaks NTLM hash via SMB Share Interaction with malicious user inputEPSS 35.8%CVE-2026-40321HIGHDotNetNuke.Core has stored cross-site-scripting (XSS) via SVG uploadEPSS 6.4%CVE-2025-59545CRITICALDNN Vulnerable to Stored Cross-Site Scripting (XSS) in the Prompt moduleEPSS 0.5%CVE-2025-59535MEDIUMDotNetNuke.Core allows loading of unused themes on anonymous clients through query parametersEPSS 0.4%CVE-2025-32374MEDIUMPossible Denial of Service (DoS) in DNN.PLATFORM registrationEPSS 0.4%