Svelte 1.13.7 and 1.13.6 are minor version updates of the Svelte JavaScript framework, a tool known for its "disappearing" nature, meaning it shifts the work of compiling components from the browser to the build step, resulting in highly performant web applications. Both versions share the same core development dependencies, crucial for building, testing, and linting the Svelte compiler. These include tools like Rollup (for bundling), Babel (for transpilation), ESLint (for code quality), and Mocha (for testing).
The key difference lies in the release date: version 1.13.7 was published on April 10, 2017, while 1.13.6 was released on April 4, 2017. A six-day gap suggests the newer version likely contains bug fixes, performance improvements, or minor feature enhancements over its predecessor, although the specifics are not detailed here.
For developers using Svelte, upgrading to the latest minor version is generally recommended to benefit from the most recent optimizations and fixes. Given the shared dependency list, the update process should be straightforward, without introducing breaking changes or requiring significant code modifications. Svelte’s approach to component compilation remains consistent across these versions, ensuring that developers can continue building reactive and efficient user interfaces. Checking the Svelte changelog for these specific versions might reveal the exact modifications implemented, allowing for better optimization and utilization of this tool.
All the vulnerabilities related to the version 1.13.7 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