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CVE-2026-49215— Symfony UX: CSRF Protection Bypass in symfony/ux-live-component — Accept Header is CORS-Safelisted

Quick assessment

Affected
symfony ux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Symfony ux是Symfony组织开源的一个Symfony的JavaScript生态系统。 Symfony UX存在跨站请求伪造漏洞，该漏洞源于Accept标头检测不足，可能导致跨源伪造请求攻击。以下版本受到影响：2.22.0版本至2.36.0之前版本和3.0.0版本至3.1.0之前版本。

AI Predicted 7.5 Difficulty: Easy EPSS 0.18% · P7

Affected Version Matrix 2

VendorProduct Version RangeStatus
symfony ux >= 3.0.0, < 3.1.0 affected
>= 2.22.0, < 2.36.0 affected
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I. Basic Information for CVE-2026-49215

Vulnerability Information
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Vulnerability Title
Symfony UX: CSRF Protection Bypass in symfony/ux-live-component — Accept Header is CORS-Safelisted
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Symfony UX 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Symfony ux是Symfony组织开源的一个Symfony的JavaScript生态系统。 Symfony UX存在跨站请求伪造漏洞，该漏洞源于Accept标头检测不足，可能导致跨源伪造请求攻击。以下版本受到影响：2.22.0版本至2.36.0之前版本和3.0.0版本至3.1.0之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
symfony ux >= 3.0.0, < 3.1.0 -

II. Public POCs for CVE-2026-49215

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III. Intelligence Information for CVE-2026-49215

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Patches & Fixes for CVE-2026-49215 (3)

Vendor Advisories for CVE-2026-49215 (1)

Same Patch Batch · symfony · 2026-07-17 · 7 CVEs total

CVE-2026-49209 Symfony UX: Denial of service in symfony/ux-live-component via unbounded batch action requ
CVE-2026-49210 Symfony UX: XSS in symfony/ux-live-component via attacker-controlled child component tag
CVE-2026-49208 Symfony UX: Format-less date LiveProps parsed with the permissive DateTime constructor
CVE-2026-49212 Symfony UX: LiveComponentHydrator HMAC checksum lacks component and slot binding
CVE-2026-49216 Symfony UX: XSS in symfony/ux-autocomplete via unescaped AJAX response data
CVE-2026-49211 Symfony UX: Information exposure via unescaped LIKE wildcards in EntitySearchUtil

IV. Related Vulnerabilities

Same product: ux
Same vendor: symfony
Same weakness: CWE-352

V. Comments for CVE-2026-49215

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