CVE-2026-26861 | THREATINT

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

PUBLISHED Reserved 2026-02-16 | Published 2026-02-27 | Updated 2026-02-27 | Assigner mitre

References

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

github.com/CleverTap/clevertap-web-sdk/pull/417

github.com/...1b65d/src/util/campaignRender/nativeDisplay.js

cve.org (CVE-2026-26861)

nvd.nist.gov (CVE-2026-26861)

Download JSON