chore(deps): update dependency svelte to v4.2.19 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
svelte (source)	4.2.9 -> 4.2.19

GitHub Vulnerability Alerts

CVE-2024-45047

Summary

A potential XSS vulnerability exists in Svelte for versions prior to 4.2.19.

Details

Svelte improperly escapes HTML on server-side rendering. It converts strings according to the following rules:

• If the string is an attribute value:
  • " -> "
  • & -> &
  • Other characters -> No conversion
• Otherwise:
  • < -> <
  • & -> &
  • Other characters -> No conversion

The assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks. More specifically, this can occur when injecting malicious content into an attribute within a <noscript> tag.

PoC

A vulnerable page (+page.svelte):

<script>
import { page } from "$app/stores"

// user input
let href = $page.url.searchParams.get("href") ?? "https://example.com";
</script>

<noscript>
  <a href={href}>test</a>
</noscript>

If a user accesses the following URL,

http://localhost:4173/?href=</noscript><script>alert(123)</script>

then, alert(123) will be executed.

Impact

XSS, when using an attribute within a noscript tag

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Release Notes

sveltejs/svelte (svelte)

v4.2.19

Compare Source

Patch Changes

• fix: ensure typings for <svelte:options> are picked up (#​12902)

• fix: escape < in attribute strings (#​12989)

v4.2.18

Compare Source

Patch Changes

• chore: speed up regex (#​11922)

v4.2.17

Compare Source

Patch Changes

• fix: correctly handle falsy values of style directives in SSR mode (#​11584)

v4.2.16

Compare Source

Patch Changes

• fix: check if svelte component exists on custom element destroy (#​11489)

v4.2.15

Compare Source

Patch Changes

• support attribute selector inside :global() (#​11135)

v4.2.14

Compare Source

Patch Changes

• fix parsing camelcase container query name (#​11131)

v4.2.13

Compare Source

Patch Changes

• fix: applying :global for +,~ sibling combinator when slots are present (#​9282)

v4.2.12

Compare Source

Patch Changes

• fix: properly update svelte:component props when there are spread props (#​10604)

v4.2.11

Compare Source

Patch Changes

• fix: check that component wasn't instantiated in connectedCallback (#​10466)

v4.2.10

Compare Source

Patch Changes

• fix: add scrollend event type (#​10336)

• fix: add fetchpriority attribute type (#​10390)

• fix: Add miter-clip and arcs to stroke-linejoin attribute (#​10377)

• fix: make inline doc links valid (#​10366)

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---

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