CVE-2026-49215
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
symfony/ux-live-componentPackagist | >= 2.22.0, < 2.36.0 | 2.36.0 |
symfony/ux-live-componentPackagist | >= 3.0.0, < 3.1.0 | 3.1.0 |
Affected products
3cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*range: >=2.22.0,<2.36.0
- cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:*
- (no CPE)range: 2.22.0 - 2.36.0, 3.1.0
Patches
Vulnerability mechanics
References
6- github.com/symfony/ux/commit/aed7493db2b4b7bf1f9c79b33cda544f06904b27nvdPatchWEB
- github.com/advisories/GHSA-4m4j-hmqq-3gxmghsaADVISORY
- github.com/symfony/ux/security/advisories/GHSA-4m4j-hmqq-3gxmnvdVendor AdvisoryWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-live-component/CVE-2026-49215.yamlghsaWEB
- github.com/symfony/ux/releases/tag/v2.36.0nvdRelease Notes
- github.com/symfony/ux/releases/tag/v3.1.0nvdRelease Notes
News mentions
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