GHSA-2g2g-8p8h-fgwm
Twig: XSS in profiler HtmlDumper via unescaped template and profile names
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
### 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.
References
External links from the advisory. They lead to third-party sites.