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TI-2026-36416 Aliases CVE-2026-49215GHSA-4m4j-hmqq-3gxm

Symfony UX: CSRF Protection Bypass in symfony/ux-live-component — Accept Header is CORS-Safelisted

Priority LOW 10CWE-352Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
Present
Impact type
Tampering
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-352.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00177 7th percentileScored 2026-11-07
Fix Fixed ux (symfony): 3.1.0, 2.36.0symfony/ux-live-component (Packagist): 2.36.0, 3.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
symfonyux3.0.0 to before 3.1.0; 2.22.0 to before 2.36.03.1.0, 2.36.0Patch availableCNA
—symfony/ux-live-component (Packagist)2.22.0 to before 2.36.02.36.0Patch availableGHSA-4m4j-hmqq-3gxm
—symfony/ux-live-component (Packagist)3.0.0 to before 3.1.03.1.0Patch availableGHSA-4m4j-hmqq-3gxm
  • ux Vendorsymfony Affected 3.0.0 to before 3.1.0; 2.22.0 to before 2.36.0 Fixed in 3.1.0, 2.36.0 Patch available CNA
  • symfony/ux-live-component (Packagist) Vendor— Affected 2.22.0 to before 2.36.0 Fixed in 2.36.0 Patch available GHSA-4m4j-hmqq-3gxm
  • symfony/ux-live-component (Packagist) Vendor— Affected 3.0.0 to before 3.1.0 Fixed in 3.1.0 Patch available GHSA-4m4j-hmqq-3gxm

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*2.22.0 to before 2.36.0Vulnerablesymfony
cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:*3.0.0Vulnerablesymfony
  • cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:* Versions 2.22.0 to before 2.36.0 Vulnerable ·symfony
  • cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:* Versions 3.0.0 Vulnerable ·symfony

Remediation

  • Fix · CNA ux (symfony) Fixed in 3.1.0, 2.36.0
  • Fix · GHSA-4m4j-hmqq-3gxm symfony/ux-live-component (Packagist) Fixed in 2.36.0 Advisory →
  • Fix · GHSA-4m4j-hmqq-3gxm symfony/ux-live-component (Packagist) Fixed in 3.1.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49215
  2. 2026-10-03 Alias added: GHSA-4m4j-hmqq-3gxm

References

Patch 1

Advisory 1

Other 4

  • TI-2026-36412 Symfony UX: Information exposure via unescaped LIKE wildcards in EntitySearchUtil CVSS 4.0MEDIUM 6.9
  • TI-2026-36409 Symfony UX: Format-less date LiveProps parsed with the permissive DateTime constructor CVSS 4.0MEDIUM 6.9
  • TI-2026-36413 Symfony UX: LiveComponentHydrator HMAC checksum lacks component and slot binding CVSS 4.0MEDIUM 6.9
  • TI-2026-40330 Symfony UX: XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses CVSS 3.1MEDIUM 6.1
  • TI-2026-36410 Symfony UX: Denial of service in symfony/ux-live-component via unbounded batch action requests CVSS 4.0MEDIUM 5.3
  • TI-2026-36417 Symfony UX: XSS in symfony/ux-autocomplete via unescaped AJAX response data CVSS 4.0MEDIUM 5.1
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences