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
References
| Link | Resource |
|---|---|
| https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/util/campaignRender/nativeDisplay.js#L118-L121 | Product |
| https://github.com/CleverTap/clevertap-web-sdk/issues/424 | Exploit Issue Tracking Vendor Advisory |
| https://github.com/CleverTap/clevertap-web-sdk/pull/417 | Patch |
Configurations
History
03 Mar 2026, 18:46
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:clevertap:clevertap_web_sdk:*:*:*:*:*:*:*:* | |
| First Time |
Clevertap clevertap Web Sdk
Clevertap |
|
| References | () https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/util/campaignRender/nativeDisplay.js#L118-L121 - Product | |
| References | () https://github.com/CleverTap/clevertap-web-sdk/issues/424 - Exploit, Issue Tracking, Vendor Advisory | |
| References | () https://github.com/CleverTap/clevertap-web-sdk/pull/417 - Patch |
27 Feb 2026, 20:21
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 8.3 |
| CWE | CWE-346 |
27 Feb 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-02-27 18:16
Updated : 2026-03-03 18:46
NVD link : CVE-2026-26861
Mitre link : CVE-2026-26861
CVE.ORG link : CVE-2026-26861
JSON object : View
Products Affected
clevertap
- clevertap_web_sdk
CWE
CWE-346
Origin Validation Error