CVE-2026-26861 – CleverTap Web SDK Cross-Site Scripting (XSS)

CVE ID : CVE-2026-26861

Published : Feb. 27, 2026, 6:16 p.m. | 56 minutes ago

Description : 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

Severity: 0.0 | NA

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