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.
References
| Link | Resource |
|---|---|
| https://github.com/symfony/ux/commit/fbc5e9a1bda7e4556be21bb1d970f382760ed9a9 | Patch |
| https://github.com/symfony/ux/releases/tag/v2.36.0 | Release Notes |
| https://github.com/symfony/ux/releases/tag/v3.1.0 | Release Notes |
| https://github.com/symfony/ux/security/advisories/GHSA-38x5-rcv4-xf7x | Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
20 Jul 2026, 16:56
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:* cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:* |
|
| References | () https://github.com/symfony/ux/commit/fbc5e9a1bda7e4556be21bb1d970f382760ed9a9 - Patch | |
| References | () https://github.com/symfony/ux/releases/tag/v2.36.0 - Release Notes | |
| References | () https://github.com/symfony/ux/releases/tag/v3.1.0 - Release Notes | |
| References | () https://github.com/symfony/ux/security/advisories/GHSA-38x5-rcv4-xf7x - Vendor Advisory | |
| First Time |
Symfony
Symfony ux |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 6.1 |
17 Jul 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-17 17:17
Updated : 2026-07-20 16:56
NVD link : CVE-2026-49210
Mitre link : CVE-2026-49210
CVE.ORG link : CVE-2026-49210
JSON object : View
Products Affected
symfony
- ux
CWE
CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')