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    CVE-2026-92781

    Builder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the unflatten helper that processes builder.userAttributes query parameters without prototype guards. Attackers can craft preview links with __proto__ or prototype segments to pollute Object.prototype in a visitor's browser when the SDK processes the malicious URL.

    Published:Sep 16, 2026
    Last Modified:Sep 21, 2026
    EPS:Sep 16, 2026
    EPSS Score:0.00259
    CVSS Score:6.3

    Affected Products

    Vendor
    Builderio
    Product
    Sdk-angular
    Vendor
    Builderio
    Product
    Sdk-qwik
    Vendor
    Builderio
    Product
    Sdk-react
    Vendor
    Builderio
    Product
    Sdk-react-nextjs
    Vendor
    Builderio
    Product
    Sdk-solid
    Vendor
    Builderio
    Product
    Sdk-svelte
    Vendor
    Builderio
    Product
    Sdk-vue

    Exploits

    No exploit reference

    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