{"cve":"CVE-2026-27122","nvd":{"published":"2026-02-20T23:16:02.640","modified":"2026-06-17T10:26:42.403","status":"Analyzed","description":"svelte performance oriented web framework. Prior to 5.51.5, when using <svelte:element this={tag}> in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N","score":5.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4},"cwes":["CWE-79"],"references":["https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp"],"products":["svelte:svelte"],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-27122","score":0.0022,"percentile":0.12588,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-m56q-vw4c-c2cp","url":"https://osv.dev/vulnerability/GHSA-m56q-vw4c-c2cp","summary":"Svelte SSR does not validate dynamic element tag names in `<svelte:element>`","modified":"2026-09-10T03:50:35.273929194Z","packages":[{"ecosystem":"npm","name":"svelte","purl":"pkg:npm/svelte","ranges":["<5.51.5"],"fixed":["5.51.5"]}]}],"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."]}