Svelte version 1.2.5 represents a minor update over its predecessor, 1.2.4, within the early stages of this "magical disappearing UI framework." Both versions share the same core philosophy, offering developers a way to build performant web applications by shifting the workload from the browser to the compilation step. This approach results in smaller, faster, and more efficient JavaScript bundles. The dependency on magic-string remains consistent, indicating a continued reliance on this tool for manipulating and generating source code during the compilation process.
The devDependencies sections are virtually identical, showing a stable toolchain for development, testing, and linting. Libraries like rollup for bundling, eslint for code quality, mocha for testing, and jsdom for simulating a browser environment are all present in both versions. The consistency here suggests a period of consolidation and refinement rather than radical changes to the development workflow.
Although the differences are subtle, the release date differential—a few hours separates the two versions—hints at a quick fix or minor refinement addressed in version 1.2.5. For developers, this signals stability in the core components with potentially small bug fixes in the later version. While the changelog (not provided) would offer concrete details, one might infer improvements in areas like edge-case handling, compiler optimizations, or perhaps corrections to recently introduced features. The core experience of using Svelte for building reactive user interfaces remains consistent between versions for most users. Upgrading from 1.2.4 to 1.2.5 would likely be seamless with small impact.
All the vulnerabilities related to the version 1.2.5 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