MEDIUM 6.1

GHSA-wv8q-r932-8hc7

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

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

npm / svelte

Introduced in: 0 Fixed in: 3.49.0

Fix npm install svelte@3.49.0

References

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]