Description
CleverTap Web SDK version 1.15.2 and earlier is vulnerable to Cross-Site Scripting (XSS) via window.postMessage. The handleCustomHtmlPreviewPostMessageEvent function in src/util/campaignRender/nativeDisplay.js performs insufficient origin validation using the includes() method, which can be bypassed by an attacker using a subdomain
Scores
CVSS v3
8.3
EPSS
0.0001
EPSS Percentile
0.8%
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-346
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