EasyAdminBundle has path traversal and reflected XSS in Flag and Icon Twig components

EasyAdminBundle ships two public Twig components — <twig:ea:Flag countryCode="..."> and <twig:ea:Icon name="..."> — that load SVG files from disk using a path built directly from a public component property, and then render the resulting markup with the Twig |raw filter.

When an application binds either of those properties to data that is influenced by an end user, the lack of validation on the property value leads to two distinct issues:

• Arbitrary .svg file disclosure (both components) — the property value is concatenated into a filesystem path without normalizing or constraining it, so .. segments are preserved and resolved by PHP. Any file on the server whose absolute path ends in .svg (for example, user-uploaded SVG icons stored elsewhere on the host) can be read and embedded into the rendered page.
• Reflected XSS in the admin UI (Flag component only) — when the requested flag file does not exist, the Flag component falls back to a hard-coded SVG string that interpolates the raw countryCode value twice, and the parent template renders that string with |raw. An attacker who controls countryCode can therefore inject arbitrary HTML/JavaScript that will execute inside the authenticated admin context that rendered the component.

The first-party usage shipped by EasyAdminBundle itself is not affected: the bundle only passes ISO 3166 alpha-2 codes validated through Symfony\Component\Intl\Countries to the Flag component, and only hard-coded internal:.. names or values previously set in PHP via MenuItem::setIcon() to the Icon component. The vulnerability is reachable only in third-party templates that pass attacker-controlled data into these properties.

Impact

Path traversal is information disclosure bounded by the .svg extension; reflected XSS in Flag runs in the admin context and is therefore more sensitive but requires a vulnerable template wiring and user interaction.

Affected components

• EasyCorp\Bundle\EasyAdminBundle\Twig\Component\Flag — public Twig tag <twig:ea:Flag>, property countryCode.
• EasyCorp\Bundle\EasyAdminBundle\Twig\Component\Icon — public Twig tag <twig:ea:Icon>, property name when the value starts with the internal: prefix.

Credit

EasyAdmin would like to thank Claude Mythos Preview (via Project Glasswing and The PHP Foundation) for reporting the issue and providing the fix.