CVE-2026-47730: Twig Cross-Site Scripting Vulnerability

LOW
Advisory Identifier: GHSA-2g2g-8p8h-fgwm
Share
CWE-79
Published
Advisory Summary

CVE-2026-47730 is a LOW cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Twig libraries in the Packagist ecosystem. The issue involves xss in profiler htmldumper via unescaped template and profile names. Remediation is available by upgrading affected packages to version 3.26.0.

CVE-2026-47730 at a Glance

CVE Identifier CVE-2026-47730
GHSA Identifier GHSA-2g2g-8p8h-fgwm
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Twig
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-47730

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

twig/twig fixed: 3.26.0 
Upgrade twig/twig to 3.26.0
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 twig/twig

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-47730, inspect your project dependencies for Twig:

inspect dependencies for twig/twig

Analyze the terminal output to locate any version of Twig in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.26.0), 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 Twig, 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

### Description `Twig\Profiler\Dumper\HtmlDumper` writes `Profile::getTemplate()` and `Profile::getName()` straight into its HTML output without escaping: ```php protected function formatTemplate(Profile $profile, $prefix): string { return \sprintf('%s└ <span style="background-color: %s">%s</span>', $prefix, self::$colors['template'], $profile->getTemplate()); } ``` The template name comes from the loader (the array key for `ArrayLoader`, a row id for a database-backed loader, etc.). When that name is attacker-controlled, the profiler dump emits arbitrary HTML, and any browser that renders it executes the injected markup. This is an output-encoding bug in profiler/debug tooling, not a sandbox escape. ### Resolution `HtmlDumper` now runs both `Profile::getTemplate()` and `Profile::getName()` through `htmlspecialchars()` before inserting them into the HTML output. ### Credits Twig would like to thank El Kharoubi Iosif for reporting the issue and Nicolas Grekas for fixing it.

CVE-2026-47730 Affected Twig Versions

1 component(s)
Fixed Versions:
3.26.0
Product / Package Ecosystem Affected Versions Fixed Version
twig/twig
 Packagist
≥ 3.0.0
< 3.26.0
3.26.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/twigphp/Twig/security/advisories/GHSA-2g2g-8p8h-fgwm
Twig Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-47730.yaml
Twig Source Repository REPOSITORY
https://github.com/twigphp/Twig
Twig Release RELEASE
https://github.com/twigphp/Twig/releases/tag/v3.26.0
symfony.com/cve-2026-47730 WEB
https://symfony.com/cve-2026-47730

Frequently Asked Questions

What is CVE-2026-47730?
CVE-2026-47730 is a security vulnerability in Twig involving XSS in profiler HtmlDumper via unescaped template and profile names under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Twig versions are affected?
Affected versions include releases prior to 3.26.0 across affected packages: twig/twig.
What version fixes CVE-2026-47730?
Upgrading to 3.26.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is twig/twig affected?
Yes, twig/twig is affected in releases prior to 3.26.0. Upgrade your dependency to 3.26.0 or later.
What CWE is associated with CVE-2026-47730?
CVE-2026-47730 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-2026-47730?
Run the dependency tree command: 'inspect dependencies for twig/twig'. 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-2g2g-8p8h-fgwm",
  "modified" : "2026-06-05T21:47:33Z",
  "published" : "2026-06-05T21:46:26Z",
  "aliases" : [ "CVE-2026-47730" ],
  "summary" : "Twig: XSS in profiler HtmlDumper via unescaped template and profile names",
  "details" : "### Description\n\n`Twig\\Profiler\\Dumper\\HtmlDumper` writes `Profile::getTemplate()` and `Profile::getName()` straight into its HTML output without escaping:\n\n```php\nprotected function formatTemplate(Profile $profile, $prefix): string\n{\n    return \\sprintf('%s└ <span style=\"background-color: %s\">%s</span>', $prefix, self::$colors['template'], $profile->getTemplate());\n}\n```\n\nThe template name comes from the loader (the array key for `ArrayLoader`, a row id for a database-backed loader, etc.). When that name is attacker-controlled, the profiler dump emits arbitrary HTML, and any browser that renders it executes the injected markup. This is an output-encoding bug in profiler/debug tooling, not a sandbox escape.\n\n### Resolution\n\n`HtmlDumper` now runs both `Profile::getTemplate()` and `Profile::getName()` through `htmlspecialchars()` before inserting them into the HTML output.\n\n### Credits\n\nTwig would like to thank El Kharoubi Iosif for reporting the issue and Nicolas Grekas for fixing it.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "twig/twig"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.26.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/twigphp/Twig/security/advisories/GHSA-2g2g-8p8h-fgwm"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-47730.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/twigphp/Twig"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/twigphp/Twig/releases/tag/v3.26.0"
  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/cve-2026-47730"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-05T21:46:26Z",
    "nvd_published_at" : null
  }
}