Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD 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 <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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
1 version affected across 1 product
🟠 Symfony UX LiveComponent, Cross-Site Scripting (XSS), #CVE-2026-49210 (Medium) -DC-Jun2026-505 https://dailycve.com/symfony-ux-livecomponent-cross-site-scripting-xss-cve-2026-49210-medium-dc-jun2026-505/
Post summary
A newly disclosed medium‑severity XSS vulnerability in Symfony UX LiveComponent (CVE‑2026‑49210) is announced with basic technical details, but no exploitation evidence or patch information is provided.
2 of 2 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | symfony | ux | - | - | - |
| App | symfony | ux | 3.0.0 | - | - |