GHSA-5j3w-5pcr-f8hg is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in symfony/ux-twig-component. O3 Security confirms whether GHSA-5j3w-5pcr-f8hg is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Symfony UX allows unsanitized HTML attribute injection via ComponentAttributes
Real-World Exposure
symfony/ux-twig-component🐘symfony/ux-live-componentReal-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
Impact
Rendering {{ attributes }} or using any method that returns a ComponentAttributes instance (e.g. only(), defaults(), without()) ouputs attribute values directly without escaping. If these values are unsafe (e.g. contain user input), this can lead to HTML attribute injection and XSS vulnerabilities.
Patches
The issue is fixed in version 2.25.1 of symfony/ux-twig-component by using Twig's EscaperRuntime to properly escape HTML attributes in ComponentAttributes. If you use symfony/ux-live-component, you must also update it to 2.25.1 to benefit from the fix, as it reuses the ComponentAttributes class internally.
Workarounds
Until you can upgrade, avoid rendering {{ attributes }} or derived objects directly if it may contain untrusted values.
Instead, use {{ attributes.render('name') }} for safe output of individual attributes.
References
GitHub repository: symfony/ux
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | symfony/ux-twig-component | all versions | 2.25.1 |
| 🐘Packagist | symfony/ux-live-component | all versions | 2.25.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for symfony/ux-twig-component. 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 symfony/ux-twig-component to 2.25.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5j3w-5pcr-f8hg 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-5j3w-5pcr-f8hg 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-5j3w-5pcr-f8hg. 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-5j3w-5pcr-f8hg in your dependencies?
O3 detects GHSA-5j3w-5pcr-f8hg across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.