# Astro astro@6.3.3 — Release & Upgrade Intelligence
- **Product:** Astro (https://astro.build)
- **Version:** astro@6.3.3
- **Released:** May 14, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/astro/updates/astro-6.3.3/

## Executive Summary (TL;DR)
Astro astro@6.3.3. Source highlight: Fixes a reflected XSS vulnerability where slot names on hydrated components were not HTML-escaped in SSR output

## Bug Fixes
- Fixes a reflected XSS vulnerability where slot names on hydrated components were not HTML-escaped in SSR output

## Upgrade Command
```bash
npm install --save-exact astro@6.3.3
```