{"cve":"CVE-2026-27118","nvd":{"published":"2026-02-20T22:16:29.673","modified":"2026-06-17T10:26:41.960","status":"Deferred","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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":5.3},"cvss_v3":null,"cwes":["CWE-346"],"references":["https://github.com/sveltejs/kit/security/advisories/GHSA-9pq4-5hcf-288c"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-27118","score":0.00276,"percentile":0.20019,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-9pq4-5hcf-288c","url":"https://osv.dev/vulnerability/GHSA-9pq4-5hcf-288c","summary":"Cache poisoning in @sveltejs/adapter-vercel","modified":"2026-02-23T23:43:51.037809Z","packages":[{"ecosystem":"npm","name":"@sveltejs/adapter-vercel","purl":"pkg:npm/%40sveltejs/adapter-vercel","ranges":["<6.3.2"],"fixed":["6.3.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}