GHSA-9j5w-2cqc-cwj9
HIGHMagento LTS vulnerable to Stored XSS via TinyMCE WYSIWYG Editor
Blast Radius
openmage/magento-ltsReal-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
From HackerOne report #1948040 by Halit AKAYDIN (hltakydn)
Impact
What kind of vulnerability is it? Who is impacted?
The TinyMCE WYSIWYG editor fails to filter scripts when rendering the HTML in specially crafted HTML tags.
Patches
Has the problem been patched? What versions should users upgrade to?
This vulnerability was fixed in version 20.2.0 by upgrading TinyMCE to a recent version in https://github.com/OpenMage/magento-lts/pull/3220
Workarounds
Is there a way for users to fix or remediate the vulnerability without upgrading?
The WYSIWYG editor features could be disabled in the configuration. Possibly some WAF appliances would filter this attack.
References
Are there any links users can visit to find out more?
The attack is simply an exploit of the "onmouseover" attribute of an img element as described on OWASP XSS Filter Evasion
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | openmage/magento-lts | all versions | 20.2.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for openmage/magento-lts. 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 openmage/magento-lts to 20.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9j5w-2cqc-cwj9 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 GHSA-9j5w-2cqc-cwj9 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 GHSA-9j5w-2cqc-cwj9. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-9j5w-2cqc-cwj9 in your dependencies?
O3 detects GHSA-9j5w-2cqc-cwj9 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.