Medium severity · published Apr 17, 2026
CVE-2026-40306
DNN has same HostGUID for all new installs
6.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DN
Dnn.Platform · dnnsoftware
>= 10.0.0, < 10.2.2 · source: vendor
DO
Dotnetnuke · Dnnsoftware
10.0.0 before 10.2.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40306
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40306
Release Notes
https://github.com/dnnsoftware/Dnn.Platform/releases/tag/v10.2.2
Vendor Advisory
https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-2rhw-gw3f-477j
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