PT-2026-51053

Name of the Vulnerable Software and Affected Versions symfony/ux-live-component versions prior to 2.x and 3.x Description An issue exists in the SymfonyUXLiveComponentLiveComponentHydrator where the HMAC Hash-based Message Authentication Code used to protect read-only props and the propsFromParen...

PT-2026-51054

Name of the Vulnerable Software and Affected Versions Symfony UX LiveComponent versions prior to 2.x Symfony UX LiveComponent versions prior to 3.x Description Methods annotated with LiveAction in symfony/ux-live-component are invokable from the browser to mutate server-side state via AJAX. The...

PT-2026-51051

Name of the Vulnerable Software and Affected Versions Symfony UX LiveComponent versions prior to 2.x Symfony UX LiveComponent versions prior to 3.x Description The createHtml function in SymfonyUXLiveComponentUtilChildComponentPartialRenderer interpolates the $childTag variable directly into the...

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...

Improper Verification of Cryptographic Signature

Overview symfony/ux-live-component is a Live components for Symfony Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via insufficient context binding in HMAC protection for Live Component properties. An attacker can modify read-only properties o...

Cross-site Scripting (XSS)

Overview symfony/ux-live-component is a Live components for Symfony Affected versions of this package are vulnerable to Cross-site Scripting XSS via improper handling of child component tag names in ChildComponentPartialRenderer::createHtml. An attacker can inject arbitrary HTML, including...

Cross-site Request Forgery (CSRF)

Overview symfony/ux-live-component is a Live components for Symfony Affected versions of this package are vulnerable to Cross-site Request Forgery CSRF via insufficient CSRF protection for LiveAction methods in symfony/ux-live-component. An attacker can invoke server-side actions on behalf of an...

Improper Validation of Unsafe Equivalence in Input

Overview symfony/ux-live-component is a Live components for Symfony Affected versions of this package are vulnerable to Improper Validation of Unsafe Equivalence in Input via hydration of writable LiveProp properties typed as DateTimeInterface. An attacker can manipulate time-based application...

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...

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 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 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 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...

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...