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.NET
.NET NuGet
Not in CISA KEV
MEDIUM severity

CVE-2020-5186 — DotNetNuke.Core

MEDIUM

CVE-2020-5186 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in DotNetNuke.Core. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

DNN XSS Vulnerability

Also known asGHSA-9phr-h5mx-4fp6
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs59th percentile — riskier than 59% of all scored CVEsHighest risk
0.00%0.46%0.93%1.39%0.4%0.9%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
.NETDotNetNuke.Core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

DNN (formerly DotNetNuke) through 9.4.4 allows XSS (issue 1 of 2).

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
.NETNuGetDotNetNuke.Coreall versionsNo fix

Affected Products

1 product · 1 configurations
Application
dotnetnukednnsoftware
≤ 9.4.4
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

DNN (formerly DotNetNuke) through 9.4.4 allows XSS (issue 1 of 2).

packetstormsecurity.comNVDFeb 2020

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for DotNetNuke.Core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of DotNetNuke.Core for CVE-2020-5186. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

DNN (formerly DotNetNuke) through 9.4.4 allows XSS (issue 1 of 2).
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CVE-2020-5186: DotNetNuke.Core: DNN XSS Vulnerability