CVE-2020-9581
MEDIUMCVE-2020-9581 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in magento/community-edition. O3 Security confirms whether CVE-2020-9581 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Magento stored cross-site scripting vulnerability
Real-World Exposure
magento/community-edition🐘magento/community-edition🐘magento/core🐘magento/project-community-editionReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Magento versions 2.3.4 and earlier, 2.2.11 and earlier (see note), 1.14.4.4 and earlier, and 1.9.4.4 and earlier have a stored cross-site scripting vulnerability. Successful exploitation could lead to sensitive information disclosure.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | magento/community-edition | all versions | No fix |
| 🐘Packagist | magento/community-edition | ≥ 2.3.0&&< 2.3.4-p2 | 2.3.4-p2 |
| 🐘Packagist | magento/core | all versions | 1.9.4.5 |
| 🐘Packagist | magento/project-community-edition | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for magento/community-edition. 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
No patched version of magento/community-edition has shipped for CVE-2020-9581 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
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-2020-9581 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-2020-9581. 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-2020-9581 in your dependencies?
O3 detects CVE-2020-9581 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.