CVE-2026-26861
High · 8.3CVSS
8.3
EPSS
0.2%
Published
Feb 27, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | clevertap-web-sdk | 0 | 1.15.3 |
Related vulnerabilities
- GHSA-j5mf-6rh3-rhgg CleverTap Web SDK is vulnerable to DOM-based XSS via handleCustomHtmlPreviewPostMessageEv… Same vulnerability
- GHSA-jfrq-hj9f-c8qx CleverTap Web SDK is vulnerable to DOM-based Cross-Site Scripting (XSS) via… Also affects clevertap-web-sdk
- CVE-2026-26862 CleverTap Web SDK version 1.15.2 and earlier is vulnerable to DOM-based Cross-Site… Also affects clevertap-web-sdk
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