Svelte, the "magical disappearing UI framework," saw a minor version update from 1.15.1 to 1.16.0, released on April 17, 2017, just a day after the previous version. Both versions share the same core description and development dependencies, signalling that the update was likely focused on bug fixes, minor enhancements, or internal refactoring rather than a major overhaul of features visible to developers.
For developers using Svelte, this means that upgrading from 1.15.1 to 1.16.0 should be a relatively smooth process with minimal risk of breaking changes. The identical devDependencies list suggests that the developer tooling and build process remain consistent. This includes key tools like Rollup for bundling, Babel for transpilation, ESLint for linting, and various Babel plugins for ES2015 transformations.
While the specific changes are not detailed in the provided data, developers should consult the official Svelte changelog or release notes for 1.16.0 to understand the precise modifications. Potential areas of improvement could involve performance optimizations, bug fixes related to specific edge cases, or minor API adjustments. Given Svelte's focus on compiling away, these changes are likely to impact the generated code and runtime efficiency rather than requiring significant code changes in user applications. It's advisable to review the update specifics to fully leverage any improvements and ensure compatibility.
All the vulnerabilities related to the version 1.16.0 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