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    CVE-2025-55303

    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.

    Published:Aug 19, 2025
    Last Modified:Nov 25, 2025
    EPS:Aug 19, 2025
    EPSS Score:0.00023
    CVSS Score:6.1

    Affected Products

    Vendor
    Astro
    Product
    Astro
    Vendor
    Withastro
    Product
    Astro

    Exploits

    https://github.com/withastro/astro/security/advisories/GHSA-xf8x-j4p2-f749https://github.com/withastro/astro/security/advisories/GHSA-xf8x-j4p2-f749

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High