Svelte version 1.55.1 is a minor patch release following version 1.55.0 of the Svelte JavaScript framework, a tool renowned for its unique approach to building user interfaces. Both versions share the same core description: "The magical disappearing UI framework," highlighting Svelte's compile-time approach, which translates component code into highly efficient vanilla JavaScript during the build process, improving runtime performance by eliminating the overhead of a virtual DOM.
Examining the devDependencies, we can see that the core dependencies remain largely consistent between the two versions, suggesting that version 1.55.1 primarily addresses bug fixes or very minor improvements, instead of introducing significant new features or dependency updates. One notable difference is the acorn version, jumping from 5.1.1 in 1.55.0 to 5.4.1 in 1.55.1. This suggests an update of the Acorn parsing library, likely related to improved JavaScript syntax support or bug fixes within the parsing process.
The dist object shows a slight size increase in the unpacked size, from 2301826 bytes to 2304573 bytes. This small increase indicates that the patch includes code enhancements, but without significant architectural changes. The release date differs, confirming that 1.55.1 is the newer release, published on February 23, 2018, shortly after 1.55.0's release on February 11, 2018. Developers should upgrade to 1.55.1 for the newest updates and potential bug fixes.
All the vulnerabilities related to the version 1.55.1 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