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OpenAdvisories
Medium · 6.9 CVE-2026-49212 EUVD-2026-45209GHSA-34w5-c283-j9fg

Symfony UX: LiveComponentHydrator HMAC checksum lacks component and slot binding

Published Jul 17, 2026 · Updated Jul 17, 2026 · Assigned by GitHub_M

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

VendorProductAffectedFixed
symfony ux >= 3.0.0, < 3.1.0, < 2.36.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist symfony/ux-live-component >= 2.8.0, < 2.36.0 2.36.0 GHSA-34w5-c283-j9fg
Packagist symfony/ux-live-component >= 3.0.0, < 3.1.0 3.1.0 GHSA-34w5-c283-j9fg

References