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CVE-2026-26862

DOM‑based Cross‑Site Scripting via Window.postMessage in CleverTap Web SDK Visual Builder

CleverTap Web SDK version 1.15.2 and earlier is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage in the Visual Builder module. The origin validation in src/modules/visualBuilder/pageBuilder.js (lines 56-60) uses the includes() method to verify the originUrl contains "dashboard.clevertap.com", which can be bypassed by an attacker using a crafted subdomain

CVSS 3.1 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Clevertap
Products
Clevertap Web Sdk Web Sdk
CVE-2026-26861

Cross‑Site Scripting via Improper Origin Validation in CleverTap Web SDK

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

CVSS 3.1 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Clevertap
Products
Clevertap Web Sdk Web Sdk