Svelte version 1.19.0, released on May 3, 2017, follows closely on the heels of version 1.18.2, which was released just a few days prior on April 30, 2017, indicating a period of active development and refinement for this "magical disappearing UI framework." While both versions share the same core description and maintain identical development dependencies, suggesting that the underlying build process and toolchain remained consistent, this doesn't tell the whole story. A quick turnaround usually hints at bug fixes, minor feature enhancements, or crucial performance tweaks implemented in the newer release. For developers, this means that upgrading from 1.18.2 to 1.19.0 likely involves minimal breaking changes while offering a potentially more stable and performant experience.
Svelte's appeal lies in its innovative approach to UI development: it shifts the workload from the browser to compile time. This eliminates the need for a virtual DOM and results in highly optimized, vanilla JavaScript code, leading to faster initial load times and improved runtime performance. While the provided data doesn't explicitly detail the specific improvements in 1.19.0, the rapid release cycle implies that the Svelte team was actively addressing issues or adding features based on user feedback or internal testing. Developers using Svelte should consult the changelog or release notes (not provided in this dataset) for a comprehensive understanding of the changes introduced in version 1.19.0 to make informed decisions about upgrading.
All the vulnerabilities related to the version 1.19.0 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