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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction Active

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
symfony ux affected
Version Status Constraints
>= 3.0.0, < 3.1.0 affected —
>= 2.22.0, < 2.36.0 affected —

No data.

No data.

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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-4m4j-hmqq-3gxm symfony/ux-live-component: CSRF Protection Bypass — Accept Header is CORS-Safelisted
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/symfony/ux/commit/aed7493db2b4b7bf1f9c79b33cda544f06904b27 cve-icon
https://github.com/symfony/ux/releases/tag/v2.36.0 cve-icon
https://github.com/symfony/ux/releases/tag/v3.1.0 cve-icon
https://github.com/symfony/ux/security/advisories/GHSA-4m4j-hmqq-3gxm cve-icon
History

Fri, 17 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 17 Jul 2026 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Symfony
Symfony ux
Vendors & Products Symfony
Symfony ux

Fri, 17 Jul 2026 16:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Symfony UX: CSRF Protection Bypass in symfony/ux-live-component — Accept Header is CORS-Safelisted
Weaknesses CWE-352
References
Metrics cvssV4_0

{'score': 2.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-17T18:05:15.930Z

Reserved: 2026-05-28T03:42:34.341Z

Link: CVE-2026-49215

cve-icon Vulnrichment

Updated: 2026-07-17T17:24:12.357Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-17T17:45:04Z

Weaknesses