Cross-site Request Forgery (CSRF) Affecting symfony/ux-live-component package, versions >=2.22.0, <2.36.0>=3.0.0, <3.1.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-SYMFONYUXLIVECOMPONENT-17339265
- published15 Jun 2026
- disclosed29 May 2026
- creditHugo Alliaume
Introduced: 29 May 2026
CVE-2026-49215 (opens in a new tab)How to fix?
Upgrade symfony/ux-live-component to version 2.36.0, 3.1.0 or higher.
Overview
symfony/ux-live-component is a Live components for Symfony
Affected versions of this package are vulnerable to Cross-site Request Forgery (CSRF) via insufficient CSRF protection for #[LiveAction] methods in symfony/ux-live-component. An attacker can invoke server-side actions on behalf of an authenticated user by issuing cross-origin requests with an Accept: application/vnd.live-component+html header. Because the Accept header is CORS-safelisted and can be set without triggering a preflight request, it does not provide effective CSRF protection, allowing forged requests to mutate server-side state.
Note: In practice, exploitation is mitigated when session cookies use SameSite=Lax (Symfony's default). Applications using SameSite=None, permissive cookie policies, or reachable through another same-origin vector remain vulnerable.