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

INFO

Published Date :

2026-02-27T00:00:00.000Z

Last Modified :

2026-02-27T19:42:58.097Z

Source :

mitre
AFFECTED PRODUCTS

The following products are affected by CVE-2026-26861 vulnerability.

Vendors Products
Clevertap
  • Clevertap Web Sdk
  • Web Sdk
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-26861.

URL Resource
https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/util/campaignRender/nativeDisplay.js#L118-L121 cve-icon cve-icon
https://github.com/CleverTap/clevertap-web-sdk/issues/424 cve-icon cve-icon
https://github.com/CleverTap/clevertap-web-sdk/pull/417 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact