{"schema":"threatline.record/2","record":{"id":"CVE-2026-114061","aliases":["GHSA-27mw-82g8-phjj"],"summary":"SvelteKit : XSS via untrusted cache-control header in prerendered page","details":"### Impact\n\nApplications that prerender pages and use `setHeaders` to set a `cache-control` header from an untrusted source are vulnerable to cross-site scripting (XSS).\n\nSvelteKit inserts the header value into a `<meta http-equiv=\"cache-control\">` tag without escaping it. An attacker who can influence this value at prerender time can break out of the `content` attribute and inject HTML or JavaScript into the generated page. The injected code can then execute when users visit the page.\n\n### Patches\n\nThe fix escapes the header value before inserting it into the generated HTML. Upgrade to `@sveltejs/kit` version 3.0.0 or later.\n\n### Workarounds\n\nAvoid forwarding untrusted `cache-control` header values with `setHeaders` on prerendered pages. Use a fixed, trusted cache policy instead.","categories":["Libraries & packages"],"product":"@sveltejs/kit","vendor":"sveltejs","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-27mw-82g8-phjj","source_modified_at":"2026-10-23T20:43:31Z","fetched_at":"2026-10-23T21:10:45.942435Z","package":{"ecosystem":"npm","name":"@sveltejs/kit"},"range":"< 3.0.0"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-114061","source_modified_at":"2026-10-21T00:36:35.456Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"kit","vendor":"sveltejs","versions":[{"lessThan":"3.0.0","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"3.0.0","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-27mw-82g8-phjj","source_modified_at":"2026-10-23T21:00:04.312966515Z","fetched_at":"2026-10-23T21:10:45.942435Z","package":{"name":"@sveltejs/kit","ecosystem":"npm","purl":"pkg:npm/%40sveltejs/kit"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.0.0"}]}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-27mw-82g8-phjj","source_modified_at":"2026-10-23T20:43:31Z","fetched_at":"2026-10-23T21:10:45.942435Z","package":{"ecosystem":"npm","name":"@sveltejs/kit"},"version":"3.0.0"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-114061","source_modified_at":"2026-10-21T00:36:35.456Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"kit","ecosystem":null},"version":"3.0.0","basis":"first unaffected version stated in the CVE record"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-27mw-82g8-phjj","source_modified_at":"2026-10-23T21:00:04.312966515Z","fetched_at":"2026-10-23T21:10:45.942435Z","package":{"name":"@sveltejs/kit","ecosystem":"npm","purl":"pkg:npm/%40sveltejs/kit"},"version":"3.0.0"}],"cvss":2.3,"severity":"Low","kev":{"listed":false},"epss":{"probability":0.00174,"percentile":0.06533,"score_date":"2026-10-23"},"published_at":"2026-10-21T00:36:35.456Z","modified_at":"2026-10-23T21:00:04.312966515Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-27mw-82g8-phjj","fetched_at":"2026-10-23T21:10:45.942435Z","source_modified_at":"2026-10-23T20:43:31Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-114061","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T00:36:35.456Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-27mw-82g8-phjj","fetched_at":"2026-10-23T21:10:45.942435Z","source_modified_at":"2026-10-23T21:00:04.312966515Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-114061","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/sveltejs/kit/security/advisories/GHSA-27mw-82g8-phjj","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114061","source":"GitHub Advisory Database"},{"url":"https://github.com/sveltejs/kit/commit/d9d55b579743c80ee7cb59c272d864fd9253dae7","source":"GitHub Advisory Database"},{"url":"https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@3.0.0","source":"GitHub Advisory Database"},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/sveltekit-before-3.0.0-xss-via-cache-control-header-in-prerendered-pages","tags":["third-party-advisory"]},{"url":"https://github.com/advisories/GHSA-27mw-82g8-phjj","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T21:00:04.312966515Z","content_hash":"4ab4e1e0d2a28d74b7e3515888cd2bf159ee18a211eaa409e7ddd417bdef667d"}}