Update dependency svelte to v4.2.19 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
svelte (source)	4.2.10 → 4.2.19
svelte (source)	4.2.2 → 4.2.19

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Svelte has a potential mXSS vulnerability due to improper HTML escaping

CVE-2024-45047 / GHSA-8266-84wp-wv5c

More information

Details

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

Severity

• CVSS Score: 5.1 / 10 (Medium)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

References

• https://github.com/sveltejs/svelte/security/advisories/GHSA-8266-84wp-wv5c
• https://github.com/sveltejs/svelte/commit/83e96e044deb5ecbae2af361ae9e31d3e1ac43a3
• https://nvd.nist.gov/vuln/detail/CVE-2024-45047
• https://github.com/advisories/GHSA-8266-84wp-wv5c

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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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)

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