CVE-2026-49215

Symfony UX is a JavaScript ecosystem for Symfony. From 2.22.0 until 2.36.0 and 3.1.0, Symfony\UX\LiveComponent\EventListener\LiveComponentSubscriber::isLiveComponentRequest() gates #[LiveAction] invocations on Accept: application/vnd.live-component+html, but the Accept header is CORS-safelisted and cross-origin fetch() can set it without preflight, allowing forged cross-origin #[LiveAction] requests against a victim session when applications use SameSite=None, credentials: 'include', a permissive cookie policy, or a same-origin pivot. This issue is fixed in versions 2.36.0 and 3.1.0.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/symfony/ux/commit/aed7493db2b4b7bf1f9c79b33cda544f06904b27	Patch
https://github.com/symfony/ux/releases/tag/v2.36.0	Release Notes
https://github.com/symfony/ux/releases/tag/v3.1.0	Release Notes
https://github.com/symfony/ux/security/advisories/GHSA-4m4j-hmqq-3gxm	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:symfony:ux::::::::
	cpe:2.3:a:symfony:ux:3.0.0:::::::*

History

24 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) Symfony UX es un ecosistema JavaScript para Symfony. Desde la versión 2.22.0 hasta la 2.36.0 y la 3.1.0, Symfony\UX\LiveComponent\EventListener\LiveComponentSubscriber::isLiveComponentRequest() restringe las invocaciones de #[LiveAction] basándose en Accept: application/vnd.live-component+html, pero el encabezado Accept está en la lista segura de CORS y fetch() de origen cruzado puede establecerlo sin preflight, permitiendo solicitudes #[LiveAction] falsificadas de origen cruzado contra una sesión de víctima cuando las aplicaciones usan SameSite=None, credentials: ’include’, una política de cookies permisiva o un pivote del mismo origen. Este problema está solucionado en las versiones 2.36.0 y 3.1.0.

Information

Published : 2026-07-17 17:17

Updated : 2026-10-24 20:10

NVD link : CVE-2026-49215

Mitre link : CVE-2026-49215

CVE.ORG link : CVE-2026-49215

JSON object : View

Products Affected

symfony

ux

CWE

CWE-352

Cross-Site Request Forgery (CSRF)

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