High severity7.5NVD Advisory· Published Jul 17, 2026· Updated Jul 20, 2026
CVE-2026-49212
CVE-2026-49212
Description
Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, the HMAC computed by Symfony\UX\LiveComponent\LiveComponentHydrator covered only sorted prop key/value pairs and did not include the component name, the slot identifier (props vs propsFromParent), or request context, allowing a signed blob minted for one component or slot to be replayed in another and set a read-only prop on a target component. This issue is fixed in versions 2.36.0 and 3.1.0.
AI Insight
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 | >= 2.8.0, < 2.36.0 | 2.36.0 |
symfony/ux-live-componentPackagist | >= 3.0.0, < 3.1.0 | 3.1.0 |
Affected products
32.8.0 - 2.35.0, 3.1.0+ 2 more
- (no CPE)range: 2.8.0 - 2.35.0, 3.1.0
- cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*range: >=2.8.0,<2.36.0
- cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
6- github.com/symfony/ux/commit/a224b5af3e2e33ee14ac71356ae0e0877900a81cnvdPatchWEB
- github.com/advisories/GHSA-34w5-c283-j9fgghsaADVISORY
- github.com/symfony/ux/security/advisories/GHSA-34w5-c283-j9fgnvdVendor AdvisoryWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-live-component/CVE-2026-49212.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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