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    CVE-2026-33943

    Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. In versions 15.10.0 through 20.8.7, a code injection vulnerability in `ECMAScriptModuleCompiler` allows an attacker to achieve Remote Code Execution (RCE) by injecting arbitrary JavaScript expressions inside `export { }` declarations in ES module scripts processed by happy-dom. The compiler directly interpolates unsanitized content into generated code as an executable expression, and the quote filter does not strip backticks, allowing template literal-based payloads to bypass sanitization. Version 20.8.8 fixes the issue.

    Published:Mar 27, 2026
    Last Modified:Apr 14, 2026
    EPS:Mar 27, 2026
    EPSS Score:0.00059
    CVSS Score:8.8

    Affected Products

    Vendor
    Capricorn86
    Product
    Happy-dom
    Vendor
    Capricorn86
    Product
    Happy Dom

    Exploits

    https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64

    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