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CVE-2025-55303— Unauthorized third-party images in Astro’s _image endpoint

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 5.13.2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。

AI Predicted 6.5 Difficulty: Easy EPSS 0.64% · P49

Public Exploits 1

Nuclei · 1 CVE-2025-55303.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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 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

Vendor Product Affected Versions CPE Subscribe
withastro astro >= 5.0.0-alpha.0, < 5.13.2 -

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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III. Intelligence Information for CVE-2025-55303

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Vendor Advisories for CVE-2025-55303 (1)

IV. Related Vulnerabilities

Same product: astro
Same vendor: withastro
Same weakness: CWE-79

V. Comments for CVE-2025-55303

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