CVE-2026-26862 Details
Description
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
A DOM-based Cross-Site Scripting (XSS) vulnerability exists in CleverTap Web SDK versions through 1.15.2. The issue arises in the Visual Builder module, where the origin validation for window.postMessage events is inadequate. The validation process can be bypassed by crafting a subdomain that includes 'dashboard.clevertap.com', allowing an attacker to inject arbitrary HTML or JavaScript into a website using the vulnerable SDK.
Users can upgrade to CleverTap Web SDK version 1.15.3 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Feb 27, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/modules/visualBuilder/pageBuilder.js#L56-L60 | [email protected] | Product |
| https://github.com/CleverTap/clevertap-web-sdk/issues/442 | [email protected] | ExploitIssue TrackingVendor Advisory |
| https://github.com/CleverTap/clevertap-web-sdk/pull/417 | [email protected] | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CISA-ADP |
| CWE-829 | Inclusion of Functionality from Untrusted Control Sphere | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| clevertap clevertap web sdk | <= 1.15.2 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 3, 2026 | Initial Analysis | [email protected] |
| Feb 27, 2026 | CVE Modified | CISA-ADP |
| Feb 27, 2026 | New CVE Received | [email protected] |