Description
Grav before 2.0.20 contains a cross-site scripting vulnerability in the Twig sandbox policy that allowlists addJs and addCss methods on Grav\Common\Assets without proper output escaping. Page editors can inject arbitrary script by registering malicious assets or injecting attributes, which are rendered unescaped into document head tags and executed for all visitors including administrators.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| getgrav | grav | < 2.0.20 | 2.0.20 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | getgrav/grav | < 2.0.20 | 2.0.20 | GHSA-8hgv-xc77-jmcr |
References
- GitHub Security Advisory (GHSA-8hgv-xc77-jmcr) vendor-advisory
- VulnCheck Advisory: Grav before 2.0.20 Cross-Site Scripting via Assets Sandbox third-party-advisory