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symfony/ux-live-component: ChildComponentPartialRenderer validates $childTag against strict HTML tag regex

ChildComponentPartialRenderer now validates $childTag against a strict HTML tag-name regex before interpolating it, rejecting invalid values.

20 Jun 2026Read 1 minSeverity: schedule it

What changed

ChildComponentPartialRenderer now validates $childTag against a strict HTML tag-name regex before interpolating it, rejecting invalid values.

Who it affects

Applications using symfony/ux-live-component with child components, especially those with relaxed CORS or same-origin XSS vulnerabilities.

What to do today

Apply the patch from commit fbc5e9a1bda7e4556be21bb1d970f382760ed9a9 or update to a fixed version.

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