high7.5
CVE-2026-49212
symfony/ux-live-component: LiveComponentHydrator HMAC checksum lacks component and slot binding
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | symfony/ux-live-component | >= 2.8.0, < 2.36.0 | 2.36.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Symfony | Ux | from 2.8.0 before 2.36.0 Version 3.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-34w5-c283-j9fg
- https://github.com/symfony/ux/security/advisories/GHSA-34w5-c283-j9fg
- https://github.com/symfony/ux/commit/a224b5af3e2e33ee14ac71356ae0e0877900a81c
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-live-component/CVE-2026-49212.yaml
- https://github.com/symfony/ux/releases/tag/v2.36.0
- https://github.com/symfony/ux/releases/tag/v3.1.0