# CVE-2025-64764: Astro - XSS

> Live exploitation tracking for CVE-2025-64764 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2025-64764

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 7.1
- **Public exploit available:** Yes
- **Affected products:** WithAstro Astro
- **Weaknesses:** CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS))
- **Tags:** javascript

## 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.

## CrowdSec analysis

[CVE-2025-64764](https://euvd.enisa.europa.eu/vulnerability/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.

## Timeline

- 2025-11-19: CVE Published. CVE-2025-64764 is published to NVD.
- 2025-12-10: Rule Released. CrowdSec releases a rule to detect CVE-2025-64764 exploitation attempts against the CrowdSec Network.
- 2025-12-15: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2025-64764 for the first time.

## References

- https://github.com/withastro/astro/security/advisories/GHSA-wrwg-2hg8-v723
- https://github.com/withastro/astro/commit/790d9425f39bbbb462f1c27615781cd965009f91
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-64764.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2025-64764) follows observed exploitation activity for CVE-2025-64764. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.