CVE-2026-40321: DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem

Q: How do I fix CVE-2026-40321?

dotnetnuke: upgrade to 10.2.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-40321 being exploited?

CVE-2026-40321 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40321 affect?

CVE-2026-40321 affects dotnetnuke. Severity is high (CVSS 8.0). 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 authenti

Q: How urgent is CVE-2026-40321?

Priority 56/100. High severity; EPSS top 6%: very likely to be exploited; On your watchlist

This month

HIGH 8.0WATCHLISTUPGRADE

CVE-2026-40321 is a high-severity flaw (CVSS 8.0) affecting dotnetnuke. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.0 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	6.4% (top 6%)
CISA exploited list	No
Weakness	CWE-87
Published	2026-04-17
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: dnnsoftware

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-17 22:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

dnnsoftware dotnetnuke UPGRADE

Affected: < 10.2.2

Fixed in: 10.2.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy dotnetnuke || rpm -q dotnetnuke || dotnetnuke --version

2. UPGRADE to 10.2.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade dotnetnuke

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dotnetnuke

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

NuGet (.NET) · DotNetNuke.Core · FIXED · 10.2.2 · vulnerable: < 10.2.2 · source

dotnet add package DotNetNuke.Core --version 10.2.2

Fedora ELN · rust-snpguest · FIXED · 0.11.0-1.eln159 · FEDORA-2026-baa01ba6c8 · source

sudo dnf upgrade --advisory=FEDORA-2026-baa01ba6c8

Fedora 46 · rust-sev · FIXED · 8.0.0-1.fc46 · FEDORA-2026-df06b5fb0c · source

sudo dnf upgrade --advisory=FEDORA-2026-df06b5fb0c

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40321?

dotnetnuke: upgrade to 10.2.2. Exact commands for each OS are on this page.

Is CVE-2026-40321 being exploited?

CVE-2026-40321 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40321 affect?

CVE-2026-40321 affects dotnetnuke. Severity is high (CVSS 8.0). 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 authenti

How urgent is CVE-2026-40321?

Priority 56/100. High severity; EPSS top 6%: very likely to be exploited; On your watchlist

Related CVEs

CVE-2026-40306 MEDIUM 6.5 UPGRADE DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem
CVE-2026-40305 MEDIUM 4.3 UPGRADE DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem

References

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