@sveltejs/kit vulnerable to XSS on dev mode 404 page

Description

“Unsanitized input from the request URL flows into end, where it is used to render an HTML page returned to the user. This may result in a Cross-Site Scripting attack (XSS).”

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-rjjv-87mx-6x3h
• CVE-2024-53261
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• @sveltejs/kit has unescaped error message included on error page - CVE-2024-53262
• @sveltejs/kit vulnerable to Cross-site Scripting via tracked search_params - CVE-2025-32388
• vue-template-compiler vulnerable to client-side Cross-Site Scripting (XSS) - CVE-2024-6783
• Webrecorder packages are vulnerable to XSS through 404 error handling logic (GHSA-w765-jm6w-4hhj) - CVE-2025-58765

Tags:

npm

@sveltejs/kit