CVE-2026-49212
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Symfony Ux
PublishedJul 17, 2026
First seenJul 17, 2026
Weakness typeCWE-345CWE-345
How to fix
Update
- symfony ux2.36.0 or later
- symfony/ux-live-component2.36.0, 3.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| symfony ux | 2.8.0 ≤ v < 2.36.0, 3.0.0 | 2.36.0 |
| symfony/ux-live-componentPackagist | 2.8.0 ≤ v < 2.36.0, 3.0.0 ≤ v < 3.1.0 | 2.36.0, 3.1.0 |
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