{"id":"CVE-2026-41067","aliases":["GHSA-j687-52p2-xcff"],"url":"https://o3.security/vulnerability/CVE-2026-41067","summary":"Astro: XSS via incomplete `</script>` sanitization in `define:vars` allows case-insensitive and whitespace-based bypass","details":"Astro is a web framework. Prior to 6.1.6, the defineScriptVars function in Astro's server-side rendering pipeline uses a case-sensitive regex /<\\/script>/g to sanitize values injected into inline <script> tags via the define:vars directive. HTML parsers close <script> elements case-insensitively and also accept whitespace or / before the closing >, allowing an attacker to bypass the sanitization with payloads like </Script>, </script >, or </script/> and inject arbitrary HTML/JavaScript. This vulnerability is fixed in 6.1.6.","published":"2026-04-24T16:57:22.940Z","modified":"2026-08-07T11:31:23.156748983Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"astro","fixedVersion":"6.1.6"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41067.json"},{"type":"ADVISORY","url":"https://github.com/withastro/astro/security/advisories/GHSA-j687-52p2-xcff"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41067"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:23.156748983Z"}}