CVE-2025-27109: Solid Lacks Escaping of HTML in JSX Fragments allows for Cross-Site Scripting (XSS)

February 25, 2025

Inserts/JSX expressions inside illegal inlined JSX fragments lacked escaping, allowing user input to be rendered as HTML when put directly inside JSX fragments.

For instance, ?text=<svg/onload=alert(1)> would trigger XSS here.

const [text] = createResource(() => {
return new URL(getRequestEvent().request.url).searchParams.get("text");
});

return (
<>
Text: {text()}
</>
);

References

github.com/advisories/GHSA-3qxh-p7jc-5xh6
github.com/solidjs/solid
github.com/solidjs/solid/commit/b93956f28ed75469af6976a98728e313d0edd236
github.com/solidjs/solid/security/advisories/GHSA-3qxh-p7jc-5xh6
nvd.nist.gov/vuln/detail/CVE-2025-27109

Code Behaviors & Features

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