CVE-2026-49212
HIGHSymfony UX: LiveComponentHydrator HMAC checksum lacks component and slot binding
Title source: cnaDescription
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 (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/symfony/ux/security/advisories/GHSA-34w5-c283-j9fg
X_Refsource_Misc x_refsource_misc
https://github.com/symfony/ux/commit/a224b5af3e2e33ee14ac71356ae0e0877900a81c
X_Refsource_Misc x_refsource_misc
https://github.com/symfony/ux/releases/tag/v2.36.0
X_Refsource_Misc x_refsource_misc
https://github.com/symfony/ux/releases/tag/v3.1.0
Scores
CVSS v3
7.5
EPSS
0.0016
EPSS Percentile
5.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-345
Status
published
Products (4)
symfony/ux
3.0.0
symfony/ux
2.8.0 - 2.36.0
symfony/ux
< 2.36.0
symfony/ux
>= 3.0.0, < 3.1.0
Published
Jul 17, 2026
Tracked Since
Jul 17, 2026