Is CVE-2026-40306 actively exploited?

CVE-2026-40306 has no public evidence of in-the-wild exploitation as of 2026-04-24.

What is the CVSS score for CVE-2026-40306?

CVE-2026-40306 has a CVSS score of 6.9 (MEDIUM severity). Vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-40306?

Patch guidance is available from dnnsoftware security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-40306.

Which products are affected by CVE-2026-40306?

1 product: dnnsoftware dotnetnuke.

CVE-2026-40306 - remediation guidance & executive summary

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 Metrics

Vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-330

Metadata

Primary Vendor: DNNSOFTWARE
Published: 4/17/2026
Last Modified: 4/24/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-40306

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary