GHSA-5gg9-gwj4-mqmj is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in OrchardCore. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for OrchardCore — see the affected versions and patch details below.
EPSS Exploitation Probability
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
OrchardCoreReal-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
OrchardCore versions starting with 1.0.0-rc1-11259 and prior to 1.4.0 are vulnerable to HTML injection. The vulnerability allows an authenticated user with an editor security role to inject a persistent HTML modal dialog component into the dashboard that will affect admin users. Version 1.4.0 contains a patch.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | OrchardCore | ≥ 1.0.0-rc1-11259&&< 1.4.0 | 1.4.0dotnet add package OrchardCore --version 1.4.0 |
Affected Products
orchardcoreorchardcoreResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for OrchardCore, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update OrchardCore to 1.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5gg9-gwj4-mqmj is resolved across your whole dependency graph.
Workarounds
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
Is GHSA-5gg9-gwj4-mqmj in your dependencies?
Find it across NuGet, including transitive dependencies.