Svelte is a UI framework that distinguishes itself with its "disappearing" nature, shifting the workload from the browser to the compilation step. Versions 1.7.0 and 1.7.1 represent a minor iteration in its early development. Both versions share identical dependencies, relying on magic-string for efficient source code manipulation and a suite of development tools for testing, linting, and building. These dev dependencies include tools like Rollup for bundling, ESLint for code quality, and Mocha for testing.
The core difference lies in the release date, with version 1.7.1 being released one day after 1.7.0. This suggests that version 1.7.1 likely includes bug fixes or very minor enhancements over its predecessor. Because the dependencies are identical, developers can expect consistent behavior and functionality across both versions.
For developers choosing between the two, opting for the slightly newer 1.7.1 is generally advisable, assuming it addresses any unforeseen issues present in the initial 1.7.0 release. Svelte's approach, moving work to compile time, results in highly optimized and performant applications, contrasting with traditional virtual DOM frameworks. Its focus on generating efficient JavaScript code translates to faster load times and improved user experience, making it an attractive choice for performance-sensitive web projects. Both versions embody this core philosophy, offering developers a way to build reactive user interfaces with a minimal runtime footprint.
All the vulnerabilities related to the version 1.7.1 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