Svelte 1.27.0 introduces incremental improvements and refinements over its predecessor, version 1.26.2, in the pursuit of making web development smoother and more efficient. Examining the metadata, the core description of Svelte remains consistent: "The magical disappearing UI framework," highlighting its key feature of shifting work from runtime to compile time, resulting in highly performant and lightweight applications.
A detailed look at the devDependencies reveals no significant changes between the two versions. Both utilize the same suite of tools for testing, linting, bundling, and code transformation, including crucial libraries like Rollup, Babel, and Typescript. This indicates a stable and well-maintained development environment for Svelte itself. While specific bug fixes and minor feature additions are not evident from this metadata alone, the small version bump (1.26.2 to 1.27.0) typically suggests enhancements focused on stability, performance, and addressing reported issues, rather than groundbreaking new features.
For developers, this implies that upgrading from 1.26.2 to 1.27.0 should be a relatively seamless process with minimal breaking changes. It's always advisable to consult the official Svelte changelog or release notes for a comprehensive list of specific modifications and potential upgrade considerations. The consistent use of development dependencies reassures that the core build process and tooling remain reliable, allowing developers to continue building Svelte applications with confidence. The release date difference also indicates active development and continuous improvement of the Svelte framework.
All the vulnerabilities related to the version 1.27.0 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