What is CVE-2026-40305?

CVE-2026-40305 is a medium-severity vulnerability in Dnnsoftware Dnn.platform, classified under Improper Authorization. CVSS score: 4.3/10. Published 2026-04-17.

How severe is CVE-2026-40305?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Dnnsoftware Dnn.platform

CVE-2026-40305

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Starting in version 6.0.0 and prior to version 10.2.2, in the friends feature, a user could craft a request that would force the acceptance of a friend request on another user. Version 10.2.2 patches the issue.

Published 2026-04-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (20.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Dnnsoftware Dnn.platform — versions >= 6.0.0, < 10.2.2
Dnnsoftware Dotnetnuke

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-fpj4-9qhx-5m6m (Vendor Advisory)
github.com/dnnsoftware/Dnn.Platform/releases/tag/v10.2.2 (Release Notes)

Frequently asked questions

What is CVE-2026-40305?: CVE-2026-40305 is a medium-severity vulnerability in Dnnsoftware Dnn.platform, classified under Improper Authorization. CVSS score: 4.3/10. Published 2026-04-17.
How severe is CVE-2026-40305?: Medium severity. CVSS v3 base score is 4.3 out of 10.