CVE

CVE-2025-55303

6.9

CVSSmedium

Exploitable remotely over the internet · no authentication required.

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.

Attack Vector

Network

Privileges Req.

None

User Interaction

None

astro

Updated Sep 18, 2026View on NVD →

S4E scanner

mediumProduct Based Web Vulnerabilities~10 seconds

Astro - Unauthorized Third-Party Image Access

Astro References: https://github.com/advisories/GHSA-xf8x-j4p2-f749 https://nvd.nist.gov/vuln/detail/CVE-2025-55303 Remediation: Update to versions 5.13.2 or 4.16.18 or later.

Used 2.6k times · url

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CVE history: astro

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