# CVE-2026-49215: Symfony UX LiveComponent CSRF in LiveAction invocations

Source: https://junglewise.ai/threats/cve-2026-49215-symfony-ux-livecomponent-csrf-in-liveaction-invocations  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-17. Updated: 2026-07-17  
License: CC BY 4.0 with a link back

CVE-2026-49215 · Severity: medium · CVSS 4 · Published 2026-07-17

A security flaw in the Symfony UX LiveComponent library could allow an attacker to perform unauthorized actions on behalf of a user. The library incorrectly relied on a specific web header for security that can actually be manipulated by malicious websites. If a user visits a malicious site while logged into an affected Symfony application, the attacker might be able to trigger server-side changes or data modifications, particularly in applications with non-standard cookie security settings.

Technologies: [symfony/ux-live-component (Packagist)](https://junglewise.ai/threats/technologies/symfony-ux-live-component), [Symfony UX Live Component](https://junglewise.ai/threats/technologies/ux-live-component). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist), [Symfony](https://junglewise.ai/threats/vendors/symfony).

## Quick answers

**Is CVE-2026-49215 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-49215 being exploited in the wild.

**How severe is CVE-2026-49215?** Medium severity, with a CVSS score of 4, published 17 July 2026.

**Which products and versions are affected?** symfony/ux-live-component (Packagist) ECOSYSTEM:introduced=2.22.0,fixed=2.36.0; Symfony UX Live Component >= 2.22.0, < 2.36.0; >= 3.0.0, < 3.1.0; Symfony UX LiveComponent >= 2.22.0, < 2.36.0; >= 3.0.0, < 3.1.0.

**Is there a fix for CVE-2026-49215?** Yes. symfony/ux-live-component (Packagist): upgrade to 2.36.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-49215 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-49215?** Check whether you run symfony/ux-live-component (Packagist), Symfony UX Live Component or Symfony UX LiveComponent at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- symfony/ux-live-component (Packagist): upgrade to 2.36.0 or later

  ```sh
  composer require symfony/ux-live-component:^2.36.0
  ```


## Technical details

A Cross-Site Request Forgery (CSRF) vulnerability exists in Symfony UX LiveComponent due to insufficient request validation in LiveComponentSubscriber::isLiveComponentRequest(). The component previously relied on the 'Accept: application/vnd.live-component+html' header to verify requests; however, because this header is CORS-safelisted, it can be set by cross-origin fetch() calls without triggering a CORS preflight. This allows an attacker to forge requests to #[LiveAction] methods. The vulnerability is most impactful in environments using 'SameSite=None' cookies or those susceptible to same-origin pivots. The fix introduces a requirement for the 'X-Requested-With' header, which is not CORS-safelisted and thus forces a preflight check that will fail for unauthorized cross-origin requests.

## Affected products

- Symfony ux-live-component >= 2.22.0, < 2.36.0; >= 3.0.0, < 3.1.0

## Identifiers

- CVE-2026-49215
- GHSA-4m4j-hmqq-3gxm

## Timeline

- 2026-05-29: patched: Versions 2.36.0 and 3.1.0 released
- 2026-05-29: advisory: GitHub Security Advisory GHSA-4m4j-hmqq-3gxm published
- 2026-07-17: disclosed: CVE-2026-49215 published to NVD

## References

- [https://github.com/symfony/ux/commit/aed7493db2b4b7bf1f9c79b33cda544f06904b27](https://github.com/symfony/ux/commit/aed7493db2b4b7bf1f9c79b33cda544f06904b27)
- [https://github.com/symfony/ux/releases/tag/v2.36.0](https://github.com/symfony/ux/releases/tag/v2.36.0)
- [https://github.com/symfony/ux/releases/tag/v3.1.0](https://github.com/symfony/ux/releases/tag/v3.1.0)
- [https://github.com/symfony/ux/security/advisories/GHSA-4m4j-hmqq-3gxm](https://github.com/symfony/ux/security/advisories/GHSA-4m4j-hmqq-3gxm)

## Related threats

- [Symfony UX insufficient verification of data authenticity in LiveComponent](https://junglewise.ai/threats/cve-2026-49212-symfony-ux-insufficient-verification-of-data-authenticity-in)
- [Symfony UX LiveComponent XSS via unvalidated child component tag](https://junglewise.ai/threats/cve-2026-49210-symfony-ux-livecomponent-xss-via-unvalidated-child-component-tag)
- [Symfony UX LiveComponent denial of service in BatchActionController](https://junglewise.ai/threats/cve-2026-49209-symfony-ux-livecomponent-denial-of-service-in)
- [Symfony UX LiveComponent improper input validation in date hydration](https://junglewise.ai/threats/cve-2026-49208-symfony-ux-livecomponent-improper-input-validation-in-date)
- [Symfony UX allows unsanitized HTML attribute injection via ComponentAttributes](https://junglewise.ai/threats/cve-2025-47946-symfony-ux-allows-unsanitized-html-attribute-injection-via)