Svelte is a UI framework celebrated for its "disappearing" act, compiling components into highly efficient vanilla JavaScript during build time, leading to exceptional runtime performance. Comparing versions 1.41.0 and 1.40.2 reveals subtle but important updates for developers. The core functionality remains consistent, ensuring existing codebases should migrate smoothly. Both versions share the same development dependencies, including tools like Rollup for bundling, ESLint for code linting, and TypeScript for type checking, suggesting a continued commitment to developer tooling and code quality.
The critical difference lies in the release date. Version 1.41.0 was released on October 17, 2017, a couple of weeks after version 1.40.2 released on October 4, 2017.This suggests that version 1.41.0 likely includes bug fixes, minor performance improvements, or small feature enhancements implemented since the previous release. While the specific changes aren't detailed in the provided data, developers should consider upgrading to 1.41.0 to benefit from the latest stability improvements and refinements. For those heavily invested in Svelte, consulting the official changelog or release notes on the Svelte GitHub repository is recommended for a comprehensive understanding of the changes introduced in version 1.41.0 and to effectively incorporate them into their projects and improve the applications performance.
All the vulnerabilities related to the version 1.41.0 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