Vulnerability Description
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Versions of @sveltejs/adapter-vercel prior to 6.3.2 are vulnerable to cache poisoning. An internal query parameter intended for Incremental Static Regeneration (ISR) is accessible on all routes, allowing an attacker to cause sensitive user-specific responses to be cached and served to other users. Successful exploitation requires a victim to visit an attacker-controlled link while authenticated. Existing deployments are protected by Vercel's WAF, but users should upgrade as soon as possible. This vulnerability is fixed in 6.3.2.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-27118?
CVE-2026-27118 is a documented vulnerability. SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Versions of @sveltejs/adapter-vercel prior to 6.3.2 are vulnerable to cache poisoning. An internal que...
How severe is CVE-2026-27118?
CVSS scoring is not yet available for CVE-2026-27118. Check NVD for updates.
Is there a patch for CVE-2026-27118?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.