CVE-2020-28470 is a high-severity (CVSS 7.3) Cross-site Scripting (XSS) vulnerability in @scullyio/scully. O3 Security confirms whether CVE-2020-28470 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Cross-site Scripting (XSS) in @scullyio/scully
Real-World Exposure
@scullyio/scully📦@scullyio/ng-libReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.
Description
This affects the package @scullyio/scully before 1.0.9. The transfer state is serialised with the JSON.stringify() function and then written into the HTML page.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @scullyio/scully | all versions | 1.0.9 |
| 📦npm | @scullyio/ng-lib | all versions | 1.0.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @scullyio/scully. 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 @scullyio/scully to 1.0.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-28470 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-2020-28470 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-2020-28470. 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-2020-28470 in your dependencies?
O3 detects CVE-2020-28470 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.