CVE-2020-36190
MEDIUMCVE-2020-36190 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in rails_admin. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether CVE-2020-36190 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
rails_admin ruby gem XSS vulnerability
Blast Radius
rails_admin💎rails_adminReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.
Description
RailsAdmin (aka rails_admin) before 1.4.3 and 2.x before 2.0.2 allows XSS via nested forms.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | rails_admin | all versions | 1.4.3 |
| 💎RubyGems | rails_admin | ≥ 2.0.0&&< 2.0.2 | 2.0.2 |
Research 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 rails_admin. 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 rails_admin to 1.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-36190 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-2020-36190 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-2020-36190. 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-2020-36190 in your dependencies?
O3 detects CVE-2020-36190 across RubyGems dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.