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
Scores
CVSS v3
8.3
EPSS
0.0002
EPSS Percentile
4.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-829
CWE-79
Status
published
Products (2)
clevertap/clevertap_web_sdk
< 1.15.2
npm/clevertap-web-sdk
0 - 1.15.3npm
Published
Feb 27, 2026
Tracked Since
Feb 28, 2026