ByteOS Network

NVD Vulnerability Details :

CVE-2026-26862

Awaiting Analysis

Source-cve@mitre.org

Published At-27 Feb, 2026 | 18:16

Updated At-02 Mar, 2026 | 20:30

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

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	8.3	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

Type: Secondary

Version: 3.1

Base score: 8.3

Base severity: HIGH

Vector:

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

Weaknesses

CWE ID	Type	Source
CWE-79	Secondary	134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE-829	Secondary	134c704f-9b21-4f2e-91b3-4a467353bcc0

CWE ID: CWE-79

Type: Secondary

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

CWE ID: CWE-829

Type: Secondary

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

References

Hyperlink	Source	Resource
https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/modules/visualBuilder/pageBuilder.js#L56-L60	cve@mitre.org	N/A
https://github.com/CleverTap/clevertap-web-sdk/issues/442	cve@mitre.org	N/A
https://github.com/CleverTap/clevertap-web-sdk/pull/417	cve@mitre.org	N/A