GHSA-5j3w-5pcr-f8hg is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in symfony/ux-twig-component. A fix is available for symfony/ux-twig-component — see the affected versions and patch details below.
Symfony UX allows unsanitized HTML attribute injection via ComponentAttributes
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-5j3w-5pcr-f8hg.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-5j3w-5pcr-f8hg plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,567 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
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 | 2.25.1composer require symfony/ux-twig-component:^2.25.1 |
| 🐘Packagist | symfony/ux-live-component | all versions | 2.25.1composer require symfony/ux-live-component:^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, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-5j3w-5pcr-f8hg can be triaged on real exposure rather than presence alone.
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 Security finds GHSA-5j3w-5pcr-f8hg across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.