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CVE-2026-26862 - Vulnerability Analysis

HighCVSS: 8.3

Last Updated: February 27, 2026

CleverTap Web SDK - Stored XSS

Published: February 27, 2026Updated: February 27, 2026Remote Exploitable

Overview

CleverTap Web SDK <= 1.15.2 contains a stored XSS caused by improper origin validation using includes() in Visual Builder module's window.postMessage, letting attackers execute scripts via crafted subdomains, exploit requires crafted subdomain.

Severity & Score

Severity: High

CVSS Score: 8.3

Impact

Attackers can execute arbitrary scripts in users' browsers, leading to session hijacking or data theft.

Mitigation

Update to a version later than 1.15.2 or the latest available version.

References

https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/modules/visualBuilder/pageBuilder.js#L56-L60
https://github.com/CleverTap/clevertap-web-sdk/issues/442
https://github.com/CleverTap/clevertap-web-sdk/pull/417

Related Resources

Vulnerability Intelligence Dashboard
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Details

CVE ID: CVE-2026-26862
Severity: High
CVSS Score: 8.3
Type: stored_xss
Status: new

CWE

CWE-79

CVSS Metrics

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