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Medium · 6.1 CVE-2025-47946 EUVD-2025-15795GHSA-5j3w-5pcr-f8hg

symfony/ux-live-component and symfony/ux-twig-component vulnerable to unsanitized HTML attribute injection via ComponentAttributes

Published May 19, 2025 · Updated May 20, 2025 · Assigned by GitHub_M

Description

Symfony UX is an initiative and set of libraries to integrate JavaScript tools into applications. Prior to version 2.25.1, 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. The issue is fixed in version `2.25.1` of `symfony/ux-twig-component` Those who use `symfony/ux-live-component` must also update it to `2.25.1` to benefit from the fix, as it reuses the `ComponentAttributes` class internally. As a workaround, avoid rendering `{{ attributes }}` or derived objects directly if it may contain untrusted values.
Instead, use `{{ attributes.render('name') }}` for safe output of individual attributes.

Affected products

VendorProductAffectedFixed
symfony ux < 2.25.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist symfony/ux-live-component < 2.25.1 2.25.1 GHSA-5j3w-5pcr-f8hg
Packagist symfony/ux-twig-component < 2.25.1 2.25.1 GHSA-5j3w-5pcr-f8hg

References