CVE-2019-12562
MEDIUMCVE-2019-12562 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in DotNetNuke.Core. 4 public exploit references exist, so weaponization risk is real. O3 Security confirms whether CVE-2019-12562 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Stored Cross-Site Scripting vulnerability in admin component of DotNetNuke
Real-World Exposure
DotNetNuke.CoreReal-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
Stored Cross-Site Scripting in DotNetNuke (DNN) Version before 9.4.0 allows remote attackers to store and embed the malicious script into the admin notification page. The exploit could be used to perfom any action with admin privileges such as managing content, adding users, uploading backdoors to the server, etc. Successful exploitation occurs when an admin user visits a notification page with stored cross-site scripting.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | DotNetNuke.Core | all versions | 9.4.0 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
DotNetNuke < 9.4.0 - Cross-Site Scripting
by MaYaSeVeN · Oct 1, 2019
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for DotNetNuke.Core. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update DotNetNuke.Core to 9.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-12562 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2019-12562 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2019-12562. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2019-12562 in your dependencies?
O3 detects CVE-2019-12562 across NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.