CVE-2026-27118
CVE-2026-27118 · Cache poisoning in @sveltejs/adapter-vercel
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 5.3 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
kit
- Versions
- < 6.3.2: Affected
No fix published
@sveltejs/adapter-vercel npm
- Affected ranges
- SEMVER: < 6.3.2
Update to 6.3.2