CVE-2026-49212

The vulnerability CVE-2026-49212 affects Symfony UX LiveComponentHydrator: the HMAC checksum previously covered only sorted prop key/value pairs and did not bind the component name, slot (props vs propsFromParent), or request context. This allowed a signed blob created for one component/slot to b...

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...