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CVE PROGRAM SOURCE RECORD6.9 Medium

CVE-2026-49212

Symfony UX: LiveComponentHydrator HMAC checksum lacks component and slot binding

Description

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 context, allowing a signed blob minted for one component or slot to be replayed in another and set a read-only prop on a target component. This issue is fixed in versions 2.36.0 and 3.1.0.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

symfony ux

  • >= 3.0.0, < 3.1.0affected
  • < 2.36.0affected

References