Vulnerability record · CVE-2026-26862 · published 27 February 2026

CVE-2026-26862: Clevertap web sdk cross-site scripting vulnerability

Clevertap · Clevertap Web Sdk

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

8.3 CVSS 3.1 High EPSS 0.53% · top 57.2% CWE-79 · Cross-site scriptingCWE-829 · Inclusion from untrusted sphere

8.3CVSS 3.1 base score

0.53%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

3References, 1 tagged exploit

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Clevertap Web Sdk Clevertap

References

Link	Tags
https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/modules/visualBuilder/pageBuilder.js#L56-L60	Product
https://github.com/CleverTap/clevertap-web-sdk/issues/442	ExploitIssue TrackingVendor Advisory
https://github.com/CleverTap/clevertap-web-sdk/pull/417	Patch

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-26862), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.