Medium severity6.1NVD Advisory· Published Jul 17, 2026· Updated Jul 20, 2026
CVE-2026-49210
CVE-2026-49210
Description
Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, Symfony\UX\LiveComponent\Util\ChildComponentPartialRenderer::createHtml() interpolates the client-controlled children[id].tag value from LiveComponentSubscriber and InterceptChildComponentRenderSubscriber directly into HTML as a tag name without escaping or validation, allowing arbitrary HTML, including tags, on any Live Component re-render that contains at least one child 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
3cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*range: >=2.8.0,<2.36.0
- cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:*
- (no CPE)range: 2.8.0 <= v < 2.36.0, 3.1.0 <= v < 3.1.0
Patches
Vulnerability mechanics
References
6- github.com/symfony/ux/commit/fbc5e9a1bda7e4556be21bb1d970f382760ed9a9nvdPatchWEB
- github.com/advisories/GHSA-38x5-rcv4-xf7xghsaADVISORY
- github.com/symfony/ux/security/advisories/GHSA-38x5-rcv4-xf7xnvdVendor AdvisoryWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-live-component/CVE-2026-49210.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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