CVE-2026-26862

HIGH

CleverTap Web SDK < 1.15.2 - DOM-based Cross-Site Scripting via Window PostMessage Origin Validation Bypass

Title source: llm
STIX 2.1

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

References (3)

Core 3

Scores

CVSS v3 8.3
EPSS 0.0037
EPSS Percentile 28.2%
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