GHSA-wv8q-r932-8hc7

Svelte vulnerable to XSS when using objects during server-side rendering

Source: GitHub Advisory Database (reviewed) Moderate CVE-2022-25875

Packages

Ecosystem	Package	Affected	Fixed in
npm	svelte	< 3.49.0	3.49.0

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2022-25875 advisory
https://github.com/sveltejs/svelte/pull/7530#23issuecomment-1158575990 web
https://github.com/sveltejs/svelte/commit/f8605d6acbf66976da9b4547f76e90e163899907 web
https://github.com/sveltejs/svelte package
https://snyk.io/vuln/SNYK-JS-SVELTE-2931080 web