Is CVE-2026-50146 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-50146?

CVE-2026-50146 has a CVSS v3 severity of HIGH (7.1).

Back

CVE-2026-50146

Description

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.