@sveltejs/kit has unescaped error message included on error page

Description

The static error.html template for errors contains placeholders that are replaced without escaping the content first.

Recommendation

Update the @sveltejs/kit package to the latest compatible version. Followings are version details:

• Affected version(s): < 2.8.3
• Patched version(s): 2.8.3

References

• GHSA-mh2x-fcqh-fmqv
• kit.svelte.dev
• CVE-2024-53262
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Server secret was included in static assets and served to clients - Vulnerability
• @sveltejs/kit vulnerable to Cross-site Scripting via tracked search_params - CVE-2025-32388
• @sveltejs/kit vulnerable to XSS on dev mode 404 page - CVE-2024-53261
• Trix allows Cross-site Scripting via `javascript:` url in a link - CVE-2025-21610

Tags:

npm

@sveltejs/kit