EUVD-2025-210564
GHSA-72f8-2pfx-xx29
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Network-delivered XSS via postMessage, no attacker auth needed, victim interaction required, scope changes to hosting origin with limited confidentiality and integrity impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
DOM-based Cross-Site Scripting in CleverTap Web SDK v1.15.1 allows an attacker to execute arbitrary JavaScript in a victim's browser by sending a crafted message via the window.postMessage API. The SDK's renderCustomHtml function processes postMessage payloads without sanitization before injecting them into the page DOM, enabling script injection in the context of any hosting site that integrates this SDK. No public exploit confirmed at time of analysis; EPSS is very low (0.16%, 6th percentile), and this vulnerability is not listed in the CISA KEV catalog.
Technical ContextAI
CleverTap is a customer engagement and analytics platform. Its Web SDK (v1.15.1) is a JavaScript library embedded by websites to enable push notifications, in-app messaging, and user analytics. The vulnerability resides in the renderCustomHtml function, which listens for window.postMessage events - a browser API allowing cross-origin inter-frame communication - and injects received data directly into the DOM without output encoding or sanitization. This maps to CWE-79 (Improper Neutralization of Input During Web Page Generation), specifically a DOM-based XSS sink pattern. The postMessage API is inherently cross-origin, meaning any window with a reference to the victim's browsing context (e.g., opener, parent frame) can send an arbitrary payload. The CPE data provided is 'n/a', indicating NVD has not yet assigned a formal product identifier, which limits automated scanning and dependency-tracking tool coverage.
RemediationAI
No vendor-released patched version has been identified at time of analysis. Security teams should monitor the CleverTap Web SDK GitHub repository (https://github.com/CleverTap/clevertap-web-sdk) and the associated issue at https://github.com/CleverTap/clevertap-web-sdk/issues/416 for a patched release. As compensating controls, operators can implement a strict Content Security Policy (CSP) with a restrictive script-src directive to limit script execution sources - this directly constrains XSS impact but may conflict with existing SDK functionality and requires testing. Additionally, postMessage event listeners on the hosting page can be audited and wrapped with origin validation checks (verifying event.origin against an allowlist) to reject messages from unexpected origins before they reach the SDK's handler. Removing or disabling the renderCustomHtml feature if it is not actively used in production is the most targeted mitigation, though SDK internals may not expose a toggle without forking the source.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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