CVE-2026-126362

Astro is a web framework for content-driven websites. From 5.7.3 until 9.1.2, the @astrojs/svelte renderer inserted a named slot into the quoted name attribute of an astro-slot wrapper without HTML escaping. Request-controlled slot names containing a quote could terminate the attribute and inject active HTML. Exploitation required a hydrated Svelte component using a client:* directive and dynamic rendering of the attacker-chosen slot; components that did not render that slot emitted only Astro's escaped fallback content. Both server rendering and client-side hydration used the unsafe slot name. This issue is fixed in version 9.1.2.

• CWE-79

• https://github.com/withastro/astro/commit/5e476365378e41aa2745d003b2383d02008d7b44
• https://github.com/withastro/astro/releases/tag/@astrojs/svelte@9.1.2
• https://github.com/withastro/astro/security/advisories/GHSA-f4j9-crrj-867q

Published

Nov 13, 2026

Last Modified

Nov 13, 2026

Status

Received

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