CVE-2025-47946: Symfony/ux twig component Symfony UX Allows Unsanitized HTML Vulnerability

MODERATE
Advisory Identifier: GHSA-5j3w-5pcr-f8hg
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2025-47946 is a MODERATE (CVSS 6.1) symfony ux allows unsanitized html vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Symfony/ux twig component libraries in the Packagist ecosystem. The issue involves symfony ux allows unsanitized html attribute injection via componentattributes. Remediation is available by upgrading affected packages to version 2.25.1.

CVE-2025-47946 at a Glance

CVE Identifier CVE-2025-47946
GHSA Identifier GHSA-5j3w-5pcr-f8hg
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Symfony/ux twig component
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2025-47946

To remediate this vulnerability, upgrade all affected Symfony/ux twig component dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

symfony/ux-twig-component fixed: 2.25.1 
Upgrade symfony/ux-twig-component to 2.25.1
symfony/ux-live-component fixed: 2.25.1 
Upgrade symfony/ux-live-component to 2.25.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for symfony/ux-twig-component

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-47946, inspect your project dependencies for Symfony/ux twig component:

inspect dependencies for symfony/ux-twig-component

Analyze the terminal output to locate any version of Symfony/ux twig component in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.25.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Symfony/ux twig component, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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](https://github.com/symfony/ux)

CVE-2025-47946 Affected Symfony/ux twig component Versions

2 component(s)
Fixed Versions:
2.25.1
Product / Package Ecosystem Affected Versions Fixed Version
symfony/ux-twig-component
 Packagist
< 2.25.1
2.25.1
symfony/ux-live-component
 Packagist
< 2.25.1
2.25.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/symfony/ux/security/advisories/GHSA-5j3w-5pcr-f8hg
NVD — CVE-2025-47946 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-47946
Security Fix Commit FIX COMMIT
https://github.com/symfony/ux-live-component/commit/7ad44cf56d750b9f56658ed986286a10da132ee7
Security Fix Commit FIX COMMIT
https://github.com/symfony/ux-twig-component/commit/b5d4e77db69315aeb18d2238e0e7c943d340ce76
Security Fix Commit FIX COMMIT
https://github.com/symfony/ux/commit/b5d1c85995c128cb926d47a96cfbfbd500b643a8
Security Fix Commit FIX COMMIT
https://github.com/symfony/ux/commit/c2f7738ee0969c31df7514025a7f5fc6e153932d
Symfony/ux twig component Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-live-component/CVE-2025-47946.yaml
Symfony/ux twig component Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-twig-component/CVE-2025-47946.yaml
Symfony/ux twig component Source Repository REPOSITORY
https://github.com/symfony/ux
symfony.com/blog/symfony-ux-cve... WEB
https://symfony.com/blog/symfony-ux-cve-2025-47946-unsanitized-html-attribute-injection-via-componentattributes

Frequently Asked Questions

What is CVE-2025-47946?
CVE-2025-47946 is a security vulnerability in Symfony/ux twig component involving Symfony UX allows unsanitized HTML attribute injection via ComponentAttributes under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Symfony/ux twig component versions are affected?
Affected versions include releases prior to 2.25.1 across affected packages: symfony/ux-twig-component, symfony/ux-live-component.
What version fixes CVE-2025-47946?
Upgrading to 2.25.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is symfony/ux-twig-component affected?
Yes, symfony/ux-twig-component is affected in releases prior to 2.25.1. Upgrade your dependency to 2.25.1 or later.
Is symfony/ux-live-component affected?
Yes, symfony/ux-live-component is affected in releases prior to 2.25.1. Upgrade your dependency to 2.25.1 or later.
What is the CVSS score of CVE-2025-47946?
CVE-2025-47946 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2025-47946?
CVE-2025-47946 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2025-47946?
Run the dependency tree command: 'inspect dependencies for symfony/ux-twig-component'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5j3w-5pcr-f8hg",
  "modified" : "2025-08-29T21:08:41Z",
  "published" : "2025-05-19T22:24:45Z",
  "aliases" : [ "CVE-2025-47946" ],
  "summary" : "Symfony UX allows unsanitized HTML attribute injection via ComponentAttributes",
  "details" : "### Impact\n\nRendering `{{ 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.\n\n### Patches\n\nThe 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.\n\n### Workarounds\n\nUntil you can upgrade, avoid rendering `{{ attributes }}` or derived objects directly if it may contain untrusted values.\nInstead, use `{{ attributes.render('name') }}` for safe output of individual attributes.\n\n### References\n\nGitHub repository: [symfony/ux](https://github.com/symfony/ux)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
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    },
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      "events" : [ {
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      }, {
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      } ]
    } ]
  }, {
    "package" : {
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      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/symfony/ux/security/advisories/GHSA-5j3w-5pcr-f8hg"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-47946"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/symfony/ux-live-component/commit/7ad44cf56d750b9f56658ed986286a10da132ee7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/symfony/ux-twig-component/commit/b5d4e77db69315aeb18d2238e0e7c943d340ce76"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/symfony/ux/commit/b5d1c85995c128cb926d47a96cfbfbd500b643a8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/symfony/ux/commit/c2f7738ee0969c31df7514025a7f5fc6e153932d"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-live-component/CVE-2025-47946.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-twig-component/CVE-2025-47946.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/symfony/ux"
  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/blog/symfony-ux-cve-2025-47946-unsanitized-html-attribute-injection-via-componentattributes"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-05-19T22:24:45Z",
    "nvd_published_at" : "2025-05-19T20:15:26Z"
  }
}