CVE-2026-26862
High · 8.3CVSS
8.3
EPSS
0.5%
Published
Feb 27, 2026
CISA due date
—
The record
CleverTap Web SDK version 1.15.2 and earlier is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage in the Visual Builder module. The origin validation in src/modules/visualBuilder/pageBuilder.js (lines 56-60) uses the includes() method to verify the originUrl contains "dashboard.clevertap.com", which can be bypassed by an attacker using a crafted subdomain
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | clevertap-web-sdk | 0 | 1.15.3 |
Related vulnerabilities
- GHSA-jfrq-hj9f-c8qx CleverTap Web SDK is vulnerable to DOM-based Cross-Site Scripting (XSS) via… Same vulnerability
- GHSA-j5mf-6rh3-rhgg CleverTap Web SDK is vulnerable to DOM-based XSS via handleCustomHtmlPreviewPostMessageEv… Also affects clevertap-web-sdk
- CVE-2026-26861 CleverTap Web SDK version 1.15.2 and earlier is vulnerable to Cross-Site Scripting (XSS)… Also affects clevertap-web-sdk
- CVE-2026-96379 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")… CWE-79
- CVE-2026-96382 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")… CWE-79
- CVE-2026-96368 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")… CWE-79
- CVE-2026-96361 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")… CWE-79
- CVE-2026-96362 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")… CWE-79