Svelte version 1.6.3 represents a minor update over its predecessor, version 1.6.2, within the Svelte framework ecosystem. Both versions maintain the core promise of Svelte: a magical disappearing UI framework renowned for its compile-time approach, resulting in highly performant and lightweight web applications. They share identical descriptions, emphasizing this key characteristic. Crucially, the core dependencies remain consistent, with both versions relying on magic-string at version ^0.19.0. The developer experience regarding core functionality should remain largely unchanged between versions.
Looking closer, the devDependencies also exhibit substantial overlap. This indicates that the underlying build and testing infrastructure remained consistent. Tools like rollup, eslint, mocha, and various Babel plugins are present, reflecting Svelte's commitment to modern JavaScript development practices of the time. The key difference lies in the release date. Version 1.6.3 was published on January 4th, 2017, shortly after 1.6.2 on January 3rd, 2017. This suggests that version 1.6.3 likely includes minor bug fixes, very targeted performance improvements, or small adjustments. Given the very short period between versions, developers migrating from 1.6.2 to 1.6.3 can expect minimal disruption but a potentially more stable and polished experience. Always review the Svelte changelog for detailed insight into the changes within this specific patch update.
All the vulnerabilities related to the version 1.6.3 of the package
Svelte vulnerable to XSS when using objects during server-side rendering
The package svelte before 3.49.0 is vulnerable to Cross-site Scripting (XSS) due to improper input sanitization and to improper escape of attributes when using objects during SSR (Server-Side Rendering). Exploiting this vulnerability is possible via objects with a custom toString() function.
Svelte has a potential mXSS vulnerability due to improper HTML escaping
A potential XSS vulnerability exists in Svelte for versions prior to 4.2.19.
Svelte improperly escapes HTML on server-side rendering. It converts strings according to the following rules:
" -> "& -> &< -> <& -> &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.
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.
XSS, when using an attribute within a noscript tag