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    CVE-2026-118660

    Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Prior to 21.0.0, Happy DOM loads iframe src URLs and link rel="stylesheet" href URLs by default while parsing untrusted HTML on the server because disableIframePageLoading and disableCSSFileLoading default to false. An attacker who controls parsed HTML can therefore cause server-side requests to arbitrary internal or cloud endpoints without an application opt-in and may expose confidential responses or credentials returned by those endpoints. This issue is fixed in version 21.0.0.

    Published:Oct 28, 2026
    Last Modified:Oct 29, 2026
    EPS:Oct 28, 2026
    EPSS Score:0.00405
    CVSS Score:8.6

    Affected Products

    Vendor
    Capricorn86
    Product
    Happy-dom

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-918 Server-Side Request Forgery

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

    Related CVEs

    CVE-2026-118661 (CVSS 6.5) — Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Prior to 20.14…
    CVE-2026-118659 (CVSS 7.5) — Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Prior to 21.0.…
    CVE-2026-115895 (CVSS 8.8) — Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. From 17.0.0 un…
    CVE-2026-34226 (CVSS 7.5) — Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Versions prior…
    CVE-2026-33943 (CVSS 8.8) — Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. In versions 15…
    CVE-2025-62410 (CVSS 9.4) — In versions before 20.0.2, it was found that --disallow-code-generation-from-strings is not sufficient for iso…
    CVE-2025-61927 (CVSS 7.2) — Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Happy DOM v19 …
    CVE-2024-51757 (CVSS 9.3) — happy-dom is a JavaScript implementation of a web browser without its graphical user interface. Versions of ha…

    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