5.3
Medium
CVE-2026-27118 SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| kit 6.3 | earliest → < 6.3.2 | 6.3.2 |
References
- github.com github.com
Timeline
- Published
- Last modified
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