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No exploitation reportedFix available

CVE-2026-40321

No exploitation reported by the sources we read.

  • Published2026-04-17
  • Fixed in10.2.2
  • WeaknessCWE-87

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-04-1722:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-25 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-40321?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-40321?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Dnnsoftware dotnetnuke
BranchAffectedFixed in
10.2< 10.2.210.2.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Dnnsoftware dotnetnuke to 10.2.2

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-04-21
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.18read 2026-10-23
  • CNAweakness (CWE)CWE-87read 2026-10-23
  • FIRST EPSSEPSS score6.4 %2026-10-25
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Published
2026-04-17
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-40321?

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.

Is CVE-2026-40321 actively exploited?

Active exploitation of CVE-2026-40321 has not been confirmed. Its EPSS score was 6.4% on 2026-10-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-40321?

CVE-2026-40321 has a CVSS v3 base score of 8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H.

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