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CVE-2025-64764— Astro is vulnerable to Reflected XSS via the server islands feature

Quick assessment

Affected
withastro astro
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Astro是Astro开源的一个内容驱动网站的 web 框架。 Astro 5.15.8之前版本存在安全漏洞，该漏洞源于服务器岛屿功能存在反射型跨站脚本漏洞，可能导致恶意代码执行。

CVSS 7.1 · High EPSS 0.49% · P40

Public Exploits 1

Nuclei · 1 CVE-2025-64764.yaml [template]

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2025-64764

Vulnerability Information
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Vulnerability Title
Astro is vulnerable to Reflected XSS via the server islands feature
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
Web页面中脚本相关HTML标签转义处理不恰当(基本跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Astro 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Astro是Astro开源的一个内容驱动网站的 web 框架。 Astro 5.15.8之前版本存在安全漏洞，该漏洞源于服务器岛屿功能存在反射型跨站脚本漏洞，可能导致恶意代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
withastro astro < 5.15.8 -

II. Public POCs for CVE-2025-64764

# POC Description Source Link Shenlong Link
1 Astro 5.15.8 contains a reflected XSS caused by improper handling of server islands feature, letting remote attackers execute scripts, exploit requires use of server islands in the application. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-64764.yaml POC Details
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Qwen3.6-35B-A3B · 6057 chars
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III. Intelligence Information for CVE-2025-64764

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Vendor Advisories for CVE-2025-64764 (1)

Same Patch Batch · withastro · 2025-11-19 · 4 CVEs total

CVE-2025-65019 5.4 MEDIUM Astro Cloudflare adapter has a Stored Cross Site Scripting vulnerability in /_image endpoi
CVE-2025-64757 3.5 LOW Astro Development Server is Vulnerable to Arbitrary Local File Read
CVE-2025-64765 Astro middleware authentication checks based on url.pathname can be bypassed via url encod

IV. Related Vulnerabilities

Same product: astro
Same vendor: withastro
Same weakness: CWE-80

V. Comments for CVE-2025-64764

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