CVE-2026-49212

HIGH7.5

Symfony UX: LiveComponentHydrator HMAC checksum lacks component and slot binding

Published Jul 17, 2026

Modified 1 months ago

Details

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.

References

WEB

https://github.com/symfony/ux/commit/a224b5af3e2e33ee14ac71356ae0e0877900a81c

WEB

https://github.com/symfony/ux/releases/tag/v2.36.0

WEB

https://github.com/symfony/ux/releases/tag/v3.1.0

WEB

https://github.com/symfony/ux/security/advisories/GHSA-34w5-c283-j9fg

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-49212

CVSS Analysis