Astro - XSS (CVE-2025-64764)
Description
Astro is a web framework. Prior to version 5.15.8, a reflected XSS vulnerability is present when the server islands feature is used in the targeted application, regardless of what was intended by the component template(s). This issue has been patched in version 5.15.8.
psychologyCrowdSec Analysis
CVE-2025-64764 is a reflected cross-site scripting (XSS) vulnerability in the Astro web framework, specifically affecting applications using the server islands feature prior to version 5.15.8. This flaw could allow remote attackers to inject and execute malicious scripts in the context of a user's browser, potentially leading to session hijacking or unauthorized actions on behalf of the user.
CrowdSec has been tracking this vulnerability and its exploits since 10th of December 2025.
CrowdSec has not observed any significant exploitation activity targeting CVE-2025-64764 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.
Attackers exploit the Astro server islands feature by sending crafted requests to URLs containing /_server-islands/ with malicious query parameters, resulting in reflected XSS payloads being executed in users' browsers.
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| Event | Date |
|---|---|
| CVE Published | 2025-11-19 |
| Rule Released | 2025-12-10 |
| CrowdSec First Seen | 2025-12-15 |