CVE-2026-49212 Symfony UX: LiveComponentHydrator HMAC checksum lacks component and slot binding

Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, the HMAC computed by Symfony\UX\LiveComponent\LiveComponentHydrator covered only sorted prop key/value pairs and did not include the component name, the slot identifier props vs propsFromParent, or request contex...

CVE-2026-55877

Symfony UX is a JavaScript ecosystem for Symfony. From 2.17.0 before 2.36.1 and from 3.0.0 before 3.2.0, the uxicon Twig function is marked issafe='html' and Icon::toHtml inlines SVG source verbatim, allowing unsanitized local SVG files or Iconify on-demand JSON body responses containing nested...

symfony/ux-icons XSS via unsanitized SVG content in local files and Iconify on-demand responses

Description The uxicon Twig function is marked issafe='html', so Twig never escapes its output. Icon::toHtml inlines the SVG source verbatim into the page. Browsers execute elements and on event-handler attributes found inside inline SVG, making any unsanitized icon a vector for cross-site...

Allocation of Resources Without Limits or Throttling

Overview symfony/ux-live-component is a Live components for Symfony Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via unbounded processing of client-supplied actions in BatchActionController::invoke. An attacker can cause denial of servic...

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...