Svelte version 1.2.3 represents a minor version update to the "magical disappearing UI framework," building upon the foundation laid by version 1.2.2. Both versions share a core description, emphasizing Svelte's unique compilation approach that shifts work from the browser to the build step, resulting in highly optimized and performant web applications.
The dependency on magic-string remains consistent, indicating continued reliance on this library for manipulating and generating source code during the compilation process. The extensive list of devDependencies, including tools like rollup, eslint, mocha, and various Babel plugins, suggests a robust development and testing environment. This ensures code quality, facilitates module bundling, and enables the use of modern JavaScript features.
The difference between version 1.2.3 and 1.2.2 is the release date: 2016-12-12T13:56:37.537Z vs 2016-12-09T20:49:44.054Z. This suggests that version 1.2.3 likely incorporates bug fixes, performance improvements, or minor enhancements introduced after the release of version 1.2.2. Developers choosing between these two versions should opt for 1.2.3 to benefit from the latest refinements. Because the semver difference is just in the patch version, it isn't expected to include breaking changes.
Both versions offer developers a component-based approach to building user interfaces, characterized by reactive updates and efficient DOM manipulation. Svelte's compilation process eliminates the need for a virtual DOM, resulting in smaller bundle sizes and faster rendering speeds. This makes it a compelling choice for projects where performance and efficiency are paramount. Developers should refer to the Svelte changelog or release notes for a comprehensive list of changes included in version 1.2.3.
All the vulnerabilities related to the version 1.2.3 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