CleverTap Web SDK v1.15.1 is vulnerable to Cross Site Scripting (XSS). The application does not sanitize untrusted data received via window.postMessage before injecting it into the page DOM. An attacker can craft a malicious message that, when processed by renderCustomHtml, results in execution of arbitrary JavaScript in the context of the hosting site.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Sun, 02 Aug 2026 08:00:00 +0000

Type Values Removed Values Added
Title Unvalidated window.postMessage Leads to XSS in CleverTap Web SDK

Fri, 31 Jul 2026 20:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-79
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 30 Jul 2026 22:00:00 +0000

Type Values Removed Values Added
First Time appeared Clevertap
Clevertap web Sdk
Vendors & Products Clevertap
Clevertap web Sdk

Thu, 30 Jul 2026 20:15:00 +0000

Type Values Removed Values Added
Description CleverTap Web SDK v1.15.1 is vulnerable to Cross Site Scripting (XSS). The application does not sanitize untrusted data received via window.postMessage before injecting it into the page DOM. An attacker can craft a malicious message that, when processed by renderCustomHtml, results in execution of arbitrary JavaScript in the context of the hosting site.
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-07-31T19:11:17.155Z

Reserved: 2025-06-16T00:00:00.000Z

Link: CVE-2025-51684

cve-icon Vulnrichment

Updated: 2026-07-31T19:11:13.321Z

cve-icon NVD

Status : Received

Published: 2026-07-30T20:16:51.793

Modified: 2026-07-31T20:16:44.277

Link: CVE-2025-51684

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-02T07:45:03Z

Weaknesses