THREATPORT/VULNERABILITY/CVE-2026-40321
HIGH SEVERITY

CVE-2026-40321

Dotnetnuke vulnerability

CVSS
8.0
EPSS
7.6%
EPSS pct
94th
Exploited
No known
DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.2.2, a user could upload a specially crafted SVG file that could include scripts that can target both authenticated and unauthenticated DNN users. The impact is increased if the scripts are run by a power user. Version 10.2.2 patches the issue.
Affected vendor
Dnnsoftware
Affected product
Dotnetnuke
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Weakness type (CWE)
Published
2026-04-17

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring low privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 7.6% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2026-40321

  • Confirm whether Dnnsoftware Dotnetnuke is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2026-40321.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-40321

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2026-40321 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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