Update dependency @sveltejs/kit to v2.20.6 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@sveltejs/kit (source)	2.17.3 -> 2.20.6

GitHub Vulnerability Alerts

CVE-2025-32388

Summary

Unsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of event.url.searchParams inside a server load function. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL.

Details

SvelteKit tracks which parameters in event.url.searchParams are read inside server load functions. If the application iterates over the these parameters, the uses.search_params array included in the boot script (embedded in the server-rendered HTML) will have any search param name included in unsanitized form.

packages/kit/src/runtime/server/utils.js:150 has the stringify_uses(node) function which prints these out.

Reproduction

In a +page.server.js or +layout.server.js:

/** @​type {import('@​sveltejs/kit').Load} */
export function load(event) {
  const values = {};

  for (const key of event.url.searchParams.keys()) {
    values[key] = event.url.searchParams.get(key);
  }
}

If a user visits the page in question via a link containing ?</script/><script>window.pwned%3D1</script/>, the </script> will be included verbatim in the payload, causing the embedded script to be executed.

It is not necessary to return the parameter value from load or render it in the page, only to read it (which causes it to be tracked as a dependency) while load is running.

Impact

Any application that iterates over all values in event.url.searchParams in a load function in +page.server.js or +layout.server.js (directly or indirectly) is vulnerable to XSS.

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Release Notes

sveltejs/kit (@​sveltejs/kit)

v2.20.6

Compare Source

Patch Changes

• fix: escape names of tracked search parameters (d3300c6a67908590266c363dba7b0835d9a194cf)

v2.20.5

Compare Source

Patch Changes

• allow HandleServerError hook to access getRequestEvent (#​13666)

• fix: prevent Rollup warnings for undefined hooks (#​13687)

v2.20.4

Compare Source

Patch Changes

• chore: remove internal class-replacement hack that isn't needed anymore (#​13664)

v2.20.3

Compare Source

Patch Changes

• fix: only call afterNavigate once on app start when SSR is disabled (#​13593)

v2.20.2

Compare Source

Patch Changes

• fix: allow non-prerendered API endpoint calls during reroute when prerendering (#​13616)

v2.20.1

Compare Source

Patch Changes

• fix: avoid using top-level await (#​13607)

v2.20.0

Compare Source

Minor Changes

• feat: add getRequestEvent to $app/server (#​13582)

v2.19.2

Compare Source

Patch Changes

• fix: lazily load CSS for dynamically imported components (#​13564)

v2.19.1

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Patch Changes

• fix: allow reroute to point to prerendered route (#​13575)

v2.19.0

Compare Source

Minor Changes

• feat: provide fetch to reroute (#​13549)

Patch Changes

• chore: cache reroute results (#​13548)

v2.18.0

Compare Source

Minor Changes

• feat: allow async reroute (#​13520)

• feat: provide normalizeUrl helper (#​13539)

Patch Changes

• fix: correct navigation history with hash router and ensure load functions are rerun on user changes to URL hash (#​13492)

• fix: include universal load assets as server assets (#​13531)

• fix: Include root layout and error nodes even when apps have only prerendered pages (#​13522)

• fix: correctly preload data on mousedown/touchstart if code was preloaded on hover (#​13530)

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