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CVE-2025-65019— Astro Cloudflare adapter has a Stored Cross Site Scripting vulnerability in /_image endpoint

Quick assessment

Affected
withastro astro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 5.15.9之前版本存在跨站脚本漏洞，该漏洞源于图像优化端点无条件允许data协议URL，可能导致跨站脚本攻击。

CVSS 5.4 · Medium EPSS 0.26% · P17
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I. Basic Information for CVE-2025-65019

Vulnerability Information
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Vulnerability Title
Astro Cloudflare adapter has a Stored Cross Site Scripting vulnerability in /_image endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Astro is a web framework. Prior to version 5.15.9, when using Astro's Cloudflare adapter (@astrojs/cloudflare) with output: 'server', the image optimization endpoint (/_image) contains a critical vulnerability in the isRemoteAllowed() function that unconditionally allows data: protocol URLs. This enables Cross-Site Scripting (XSS) attacks through malicious SVG payloads, bypassing domain restrictions and Content Security Policy protections. This issue has been patched in version 5.15.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Astro 跨站脚本漏洞
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 5.15.9之前版本存在跨站脚本漏洞，该漏洞源于图像优化端点无条件允许data协议URL，可能导致跨站脚本攻击。
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 < 5.15.9 -

II. Public POCs for CVE-2025-65019

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III. Intelligence Information for CVE-2025-65019

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Vendor Advisories for CVE-2025-65019 (1)

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

CVE-2025-64764 7.1 HIGH Astro is vulnerable to Reflected XSS via the server islands feature
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-79

V. Comments for CVE-2025-65019

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