CVE-2025-55303— Unauthorized third-party images in Astro’s _image endpoint
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I. Basic Information for CVE-2025-55303
Vulnerability Information
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Vulnerability Title
Unauthorized third-party images in Astro’s _image endpoint
Source: NVD (National Vulnerability Database)
Vulnerability Description
Astro is a web framework for content-driven websites. In versions of astro before 5.13.2 and 4.16.18, the image optimization endpoint in projects deployed with on-demand rendering allows images from unauthorized third-party domains to be served. On-demand rendered sites built with Astro include an /_image endpoint which returns optimized versions of images. A bug in impacted versions of astro allows an attacker to bypass the third-party domain restrictions by using a protocol-relative URL as the image source, e.g. /_image?href=//example.com/image.png. This vulnerability is fixed in 5.13.2 and 4.16.18.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
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 5.13.2之前版本和4.16.18之前版本存在安全漏洞，该漏洞源于图像优化端点可能绕过第三方域名限制。
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
II. Public POCs for CVE-2025-55303
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | Astro < 5.13.2 and < 4.16.18 contains an information disclosure vulnerability caused by improper validation of protocol-relative URLs in the image optimization endpoint, letting attackers serve images from unauthorized third-party domains, exploit requires on-demand rendering deployment. | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-55303.yaml | POC Details |
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V. Comments for CVE-2025-55303
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