CVE-2025-64764
High · 7.1Astro vulnerable to reflected XSS via the server islands feature
CVSS
7.1
EPSS
0.5%
Published
Nov 19, 2025
CISA due date
—
The record
After some research it appears that it is possible to obtain a reflected XSS when the server islands feature is used in the targeted application, **regardless of what was intended by the component template(s)**.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | astro | 0 | 5.15.8 |
Related vulnerabilities
- GHSA-wrwg-2hg8-v723 Astro vulnerable to reflected XSS via the server islands feature Same vulnerability
- CVE-2026-54298 Astro is a web framework. Also affects astro
- CVE-2026-54299 Astro is a web framework. Also affects astro
- CVE-2026-50146 Astro is a web framework. Also affects astro
- GHSA-jrpj-wcv7-9fh9 Astro: XSS via Unescaped Attribute Names in Spread Props Also affects astro
- GHSA-2pvr-wf23-7pc7 Astro: Host header SSRF in prerendered error page fetch Also affects astro
- GHSA-8hv8-536x-4wqp Astro: Reflected XSS via unescaped slot name Also affects astro
- CVE-2026-45028 Astro is a web framework. Also affects astro