cvedb.io
CVE-2026-26861
HIGH · CVSS 8.3
EPSS exploitation probability: 0%
Published 2026-02-27T18:16:12.043 · Last modified 2026-06-17T10:26:21.957

Summary

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

Affected products

clevertap — clevertap_web_sdk

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.