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Mend.io Vulnerability Database

CVE-2025-55303

Good to know:

Date: August 19, 2025

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.

Severity Score

0.0

Related Resources (5)

Url: https://github.com/withastro/astro/security/advisories/GHSA-xf8x-j4p2-f749

Url: https://github.com/withastro/astro

Url: https://github.com/withastro/astro/commit/4d16de7f95db5d1ec1ce88610d2a95e606e83820

Url: https://nvd.nist.gov/vuln/detail/CVE-2025-55303

Url: https://www.mend.io/vulnerability-database/CVE-2025-55303

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

Misinterpretation of Input

CWE-115

Top Fix

Upgrade Version

Upgrade to version astro - 5.13.2;astro - 4.16.19;@astrojs/node - 9.1.1

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CVSS v3.1

Base Score:	0.0
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	LOW
Privileges Required (PR):	NONE
User Interaction (UI):	REQUIRED
Scope (S):	CHANGED
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	NONE