CVE-2026-41067 — Astro: XSS via incomplete `` sanitization in `define:vars` allows case-insensitive and whitespace-based bypass

Affected: withastro astro

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.

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CVE-2026-41067 — Astro: XSS via incomplete `` sanitization in `define:vars` allows case-insensitive and whitespace-based bypass