CVE-2025-47946

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.

Reserved 2025-05-14 | Published 2025-05-19 | Updated 2025-05-20 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 2.25.1
affected

References

github.com/...ony/ux/security/advisories/GHSA-5j3w-5pcr-f8hg

github.com/...ommit/b5d1c85995c128cb926d47a96cfbfbd500b643a8

cve.org (CVE-2025-47946)

nvd.nist.gov (CVE-2025-47946)

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