CVE-2026-26862

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

CVSS v3 8.3 HIGH

8.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/modules/visualBuilder/pageBuilder.js#L56-L60	Product
https://github.com/CleverTap/clevertap-web-sdk/issues/442	Exploit Issue Tracking Vendor Advisory
https://github.com/CleverTap/clevertap-web-sdk/pull/417	Patch

Configurations

Configuration 1 (hide)

cpe:2.3:a:clevertap:clevertap_web_sdk:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-02-27 18:16

Updated : 2026-03-03 18:44

NVD link : CVE-2026-26862

Mitre link : CVE-2026-26862

CVE.ORG link : CVE-2026-26862

JSON object : View

Products Affected

clevertap

clevertap_web_sdk

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-829

Inclusion of Functionality from Untrusted Control Sphere

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