CVE-2026-49212
Published:July 17, 2026
Updated:July 21, 2026
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
https://github.com/symfony/ux.git (GITHUB):
Affected version(s) =v3.0.0 <v3.1.0Fix Suggestion:
Update to version v3.1.0https://github.com/symfony/ux.git (GITHUB):
Affected version(s) >=v2.8.0 <v2.36.0Fix Suggestion:
Update to version v2.36.0symfony/ux-live-component (PHP):
Affected version(s) >=v2.8.0 <v2.36.0Fix Suggestion:
Update to version v2.36.0symfony/ux-live-component (PHP):
Affected version(s) =v3.0.0 <v3.1.0Fix Suggestion:
Update to version v3.1.0Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Insufficient Verification of Data Authenticity
EPSS
Base Score:
0.16