Is CVE-2026-40306 in the CISA KEV catalog?

No. CVE-2026-40306 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-40306?

CVE-2026-40306 has a CVSS v3 base score of 6.5 (MEDIUM).

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

CVE-2026-40306 has an EPSS score of 0.18% (7th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40306?

Upgrade dotnetnuke to 10.2.2 or later.

CVE & CISA-KEV Catalog

CVE-2026-40306

MEDIUM

6.5

CVSS v3

NVD

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.

CWE-330

How to fix

Remediation Available

dotnetnukeNVD

Affected:>= 10.0.0, < 10.2.2Fixed in:10.2.2CVE-2026-40306derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploit Intelligence

0.18%probability of exploitation in 30 days

7thpercentile

Low risk: more likely to be exploited than 7% of all known CVEs.

References

Vendor Advisory1

github.com

Release Notes1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-24.