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

Description

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.

Recommendation

Update the svelte package to the latest compatible version. Followings are version details:

• Affected version(s): < 3.49.0
• Patched version(s): 3.49.0

References

• GHSA-wv8q-r932-8hc7
• snyk.io
• CVE-2022-25875
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• uppy's companion module is vulnerable to Server-Side Request Forgery (SSRF) (GHSA-x8rq-rc7x-5fg5) - CVE-2022-0086
• Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent` - CVE-2026-27901
• jQuery UI vulnerable to XSS when refreshing a checkboxradio with an HTML-like initial text label - CVE-2022-31160
• uppy's companion module is vulnerable to Server-Side Request Forgery (SSRF) - CVE-2022-0086

Tags:

npm

svelte