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    CVE-2025-65019

    Astro is a web framework. Prior to version 5.15.9, when using Astro's Cloudflare adapter (@astrojs/cloudflare) with output: 'server', the image optimization endpoint (/_image) contains a critical vulnerability in the isRemoteAllowed() function that unconditionally allows data: protocol URLs. This enables Cross-Site Scripting (XSS) attacks through malicious SVG payloads, bypassing domain restrictions and Content Security Policy protections. This issue has been patched in version 5.15.9.

    Published:Nov 19, 2025
    Last Modified:Nov 25, 2025
    EPS:Nov 19, 2025
    EPSS Score:0.00031
    CVSS Score:5.4

    Affected Products

    Vendor
    Astro
    Product
    Astro
    Vendor
    Withastro
    Product
    Astro

    Exploits

    https://github.com/withastro/astro/security/advisories/GHSA-fvmw-cj7j-j39q

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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