{"action":"Upgrade svelte to 5.51.5 or later.","affected":[{"fixed":"5.51.5","introduced":"0"}],"component":"svelte","cve_ids":["CVE-2026-27121"],"ecosystem":"npm","epss":0.0022,"exploited":false,"fixed_versions":["5.51.5"],"ghsa_id":"GHSA-f7gr-6p89-r883","id":"tcs_01M5KFMVQCA4Q1GRMVD4Z6AC6T","modified_at":"2026-09-10T03:50:34.768480170Z","published_at":"2026-02-19T15:18:33Z","references":["https://osv.dev/vulnerability/GHSA-f7gr-6p89-r883","https://github.com/sveltejs/svelte/security/advisories/GHSA-f7gr-6p89-r883","https://nvd.nist.gov/vuln/detail/CVE-2026-27121","https://github.com/sveltejs/svelte"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"GHSA-f7gr-6p89-r883","url":"https://osv.dev/vulnerability/GHSA-f7gr-6p89-r883"},{"source":"nvd","source_id":"CVE-2026-27121","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27121"}],"summary":"Svelte affected by cross-site scripting via spread attributes in Svelte SSR"}