Twig: XSS in profiler HtmlDumper via unescaped template and profile names
Description
Twig\Profiler\Dumper\HtmlDumper writes Profile::getTemplate() and Profile::getName() straight into its HTML output without escaping:
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | twig/twig | >= 3.0.0, < 3.26.0 | 3.26.0 |
References
- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
twig/twig- Disclosed
- 05.06.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-2g2g-8p8h-fgwm - CC BY 4.0
Vulnerability history: twig/twig
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 24
- First → latest
- 02.2022 07.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 8
- Medium 8
- Low 7
Disclosures per year
- 2022: 4
- 2023: 0
- 2024: 4
- 2025: 1
- 2026: 15
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Twig: XSS in profiler HtmlDumper via unescaped template and profile names this entry
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