CVE-2026-50146 — Astro: Reflected XSS via unescaped slot name
Astro is a web framework. Prior to 6.3.3, when a component uses a client:* directive, Astro inserts named slot content into a data-astro-template attribute without HTML escaping…
Published: 2026-06-22 · CVSS: 7.1 · CVSS 3.1
Astro is a web framework. Prior to 6.3.3, when a component uses a client:* directive, Astro inserts named slot content into a data-astro-template attribute without HTML escaping the slot name allowing an attacker to break out of the attribute context and inject arbitrary HTML, resulting in reflected XSS during SSR. This vulnerability is fixed in 6.3.3.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7