CVE-2026-26861

HighCVSS 8.3/10Last modified Jun 17, 2026

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

Metrics

CVSS 3.1 8.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

Weakness enumeration

CWE-346

Affected software

No affected versions have been published.

Timeline

Published
Feb 27, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2026-26861: High severity, CVSS 8.3 | Vulnix