symfony/ux-live-component LiveComponentHydrator HMAC checksum lacks component and slot binding

Description In symfony/ux-live-component, a component's server-side state is exposed to the browser as a set of props LiveProp-annotated properties. Props marked writable: true can be freely changed by the client. Read-only props are round-tripped to the browser and back, and their integrity is...

symfony/ux-live-component CSRF Protection Bypass: Accept Header is CORS-Safelisted

Description When using symfony/ux-live-component, methods annotated with LiveAction are invokable from the browser and mutate server-side state via AJAX. Symfony\UX\LiveComponent\EventListener\LiveComponentSubscriber::isLiveComponentRequest gated these invocations on the presence of Accept:...

symfony/ux-live-component Format-less date LiveProps parsed with the permissive DateTime constructor

Description When a LiveProp is typed as a DateTimeInterface and no explicit format is configured, Symfony\UX\LiveComponent\LiveComponentHydrator::hydrateObjectValue falls back to new $className$value. The DateTime / DateTimeImmutable constructors accept relative strings such as "now", "tomorrow",...

symfony/ux-live-component Denial of service via unbounded batch action requests

Description Symfony\UX\LiveComponent\Controller\BatchActionController::invoke iterates over the client-supplied actions array and issues a full HttpKernel sub-request for each entry event subscribers, validators, Doctrine, rendering. The array size is never bounded, so an authenticated client can...

symfony/ux-live-component XSS via attacker-controlled child component tag

Description Symfony\UX\LiveComponent\Util\ChildComponentPartialRenderer::createHtml interpolates the $childTag argument directly into the HTML output as a tag name, without escaping or validation. The value originates from client-controlled JSON childrenid.tag parsed by LiveComponentSubscriber an...

CVE-2025-47946

Summary: CVE-2025-47946 affects Symfony UX components. Prior to 2.25.1, rendering {{ attributes }} or using methods returning a ComponentAttributes instance can output unescaped attribute values, risking HTML attribute injection and XSS. The vulnerability affects the Symfony UX Twig component and...

symfony/ux-live-component Unsanitized HTML attribute injection via ComponentAttributes

More info at https://symfony.com/blog/symfony-ux-cve-2025-47946-unsanitized-html-attribute-injection-via-componentattributes...