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CVE-2026-49210

2.3 low SSVC exploitation: none Analyzed
NVD · CVE.org

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 <script> 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.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 2.3 · symfonyNVD modified 2026-10-24 20:10

Affected (CPE criteria) 2

  • cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*
  • cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:*

References 4