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.
Metrics
Affected Vendors & Products
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References
History
Fri, 20 Feb 2026 21:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Cache poisoning in @sveltejs/adapter-vercel | |
| Weaknesses | CWE-346 | |
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| Metrics |
cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-02-20T21:24:55.577Z
Reserved: 2026-02-17T18:42:27.043Z
Link: CVE-2026-27118
Vulnrichment
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NVD
Status : Received
Published: 2026-02-20T22:16:29.673
Modified: 2026-02-20T22:16:29.673
Link: CVE-2026-27118
Redhat
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