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    CVE-2026-34226

    Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Versions prior to 20.8.9 may attach cookies from the current page origin (`window.location`) instead of the request target URL when `fetch(..., { credentials: "include" })` is used. This can leak cookies from origin A to destination B. Version 20.8.9 fixes the issue.

    Published:Mar 27, 2026
    Last Modified:Aug 19, 2026
    EPS:Mar 27, 2026
    EPSS Score:0.00458
    CVSS Score:7.5

    Affected Products

    Vendor
    Capricorn86
    Product
    Happy-dom
    Vendor
    Capricorn86
    Product
    Happy Dom

    Exploits

    https://github.com/capricorn86/happy-dom/security/advisories/GHSA-w4gp-fjgq-3q4g

    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