CVE Feed

    Dashboard / CVE / CVE-2026-26861

    CVE-2026-26861

    CleverTap Web SDK version 1.15.2 and earlier is vulnerable to Cross-Site Scripting (XSS) via window.postMessage. The handleCustomHtmlPreviewPostMessageEvent function in src/util/campaignRender/nativeDisplay.js performs insufficient origin validation using the includes() method, which can be bypassed by an attacker using a subdomain

    Published:Feb 27, 2026
    Last Modified:Apr 16, 2026
    EPS:Feb 27, 2026
    EPSS Score:0.00025
    CVSS Score:8.3

    Affected Products

    Vendor
    Clevertap
    Product
    Clevertap Web Sdk
    Vendor
    Clevertap
    Product
    Web Sdk

    Exploits

    https://github.com/CleverTap/clevertap-web-sdk/issues/424

    Common Weakness Enumeration

    CWE-346 Origin Validation Error

    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