Generation of Predictable Numbers or Identifiers in DotNetNuke - CVE-2026-40306
Published: April 11, 2026
Vulnerability identifier: #VU125827
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-40306
CWE-ID: CWE-340
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: DNN
Affected software:
DotNetNuke
DotNetNuke
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass host identity assumptions.
The vulnerability exists due to the use of a hardcoded or non-unique identifier in HostGUID generation in the HostGUID installation logic when creating a new installation. A remote attacker can rely on the predictable HostGUID value to bypass host identity assumptions.
Only new installations are affected; upgrades from 9.x.x are not affected.
How to mitigate CVE-2026-40306
Install security update from vendor's website.